@zone-eu/mailsplit - npm Package Compare versions

Comparing version 5.4.10 to 5.4.11

index.d.ts

@@ -12,8 +12,21 @@ /// <reference types="node" />
 export {
+    /** Splits raw message bytes into MIME node and content chunks. */
     Splitter,
+
+    /** Joins MIME node and content chunks back into raw message bytes. */
     Joiner,
+
+    /** Rewrites body content for MIME nodes selected by a filter function. */
     Rewriter,
+
+    /** Streams decoded body content for MIME nodes selected by a filter function. */
     Streamer,
+
+    /** Buffers byte input and emits larger Buffer chunks. */
     ChunkedPassthrough,
+
+    /** Parses, mutates, and rebuilds message header blocks. */
     Headers,
+
+    /** Represents one parsed MIME node and its header/body metadata. */
     MimeNode
@@ -23,24 +36,67 @@ };
 export type {
+    /** Value that is either present as `T` or explicitly unavailable as `false`. */
     Maybe,
+
+    /** Single item in an IMAP-style MIME part number. */
     PartNumberItem,
+
+    /** IMAP-style path to a MIME part. */
     PartNumber,
+
+    /** Options passed through to libmime instances. */
     LibmimeOptions,
+
+    /** Configuration for `Splitter` and MIME node parsing. */
     SplitterOptions,
+
+    /** Configuration for `ChunkedPassthrough`. */
     ChunkedPassthroughOptions,
+
+    /** Configuration for format=flowed decoding. */
     FlowedDecoderOptions,
+
+    /** Parsed raw header line with a normalized lookup key. */
     HeaderLine,
+
+    /** Decoded structured header value. */
     DecodedHeader,
+
+    /** MIME node shape emitted by `Splitter`. */
     MimeNode,
+
+    /** Data or body bytes emitted by `Splitter`. */
     MessageChunk,
+
+    /** Sentinel input used internally by rewriter/streamer transforms. */
     EmptyChunk,
+
+    /** Object emitted by `Splitter`. */
     SplitterChunk,
+
+    /** Object accepted by rewriter and streamer transforms. */
     RewriterInput,
+
+    /** Predicate used to select MIME nodes. */
     FilterFunc,
+
+    /** Error object that may include a Node-style string code. */
     ErrorWithCode,
+
+    /** Callback that resumes processing after a selected node stream ends. */
     ContinueCallback,
+
+    /** Content transform stream used for decoded or encoded node bodies. */
     ContentStream,
+
+    /** Decoder stream with an internal readable-state guard. */
     DecoderStream,
+
+    /** Internal splitter grouping state. */
     SplitterGroup,
+
+    /** Payload emitted with `Rewriter`'s `node` event. */
     RewriterNode,
+
+    /** Payload emitted with `Streamer`'s `node` event. */
     StreamerNode
 } from './lib/types';

lib/chunked-passthrough.d.ts

 import { Transform } from 'node:stream';
 import type { ChunkedPassthroughOptions } from './types';
 
+/** Transform stream that buffers byte input and emits larger Buffer chunks. */
 declare class ChunkedPassthrough extends Transform {
+    /**
+     * Creates a chunking passthrough transform that accepts Buffer input and emits Buffer chunks.
+     *
+     * @param options Optional chunk size configuration.
+     */
     constructor(options?: ChunkedPassthroughOptions);
+
+    /**
+     * Registers a listener for buffered byte chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each buffered Buffer chunk.
+     * @returns This passthrough instance.
+     */
     on(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Registers a one-time listener for the next buffered byte chunk.
+     *
+     * @param event Event name.
+     * @param listener Receives the next buffered Buffer chunk.
+     * @returns This passthrough instance.
+     */
     once(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Adds a listener for buffered byte chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each buffered Buffer chunk.
+     * @returns This passthrough instance.
+     */
     addListener(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Prepends a listener for buffered byte chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each buffered Buffer chunk.
+     * @returns This passthrough instance.
+     */
     prependListener(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Emits a buffered byte chunk.
+     *
+     * @param event Event name.
+     * @param data Buffer chunk to emit.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'data', data: Buffer): boolean;
@@ -11,0 +57,0 @@ }

lib/chunked-passthrough.js

@@ -5,2 +5,5 @@ 'use strict';
 
+/**
+ * Transform stream that buffers byte input and emits larger Buffer chunks.
+ */
 class ChunkedPassthrough extends Transform {
@@ -7,0 +10,0 @@ /**

lib/flowed-decoder.d.ts

 import { Transform } from 'node:stream';
 import type { FlowedDecoderOptions } from './types';
 
+/** Transform stream that decodes `text/plain; format=flowed` content. */
 declare class FlowedDecoder extends Transform {
+    /**
+     * Creates a flowed text decoder that accepts encoded text bytes and emits decoded Buffer chunks.
+     *
+     * @param config Optional flowed text and charset decoding settings.
+     */
     constructor(config?: FlowedDecoderOptions);
+
+    /**
+     * Registers a listener for decoded flowed text bytes.
+     *
+     * @param event Event name.
+     * @param listener Receives decoded Buffer chunks.
+     * @returns This decoder instance.
+     */
     on(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Registers a one-time listener for the next decoded flowed text chunk.
+     *
+     * @param event Event name.
+     * @param listener Receives the next decoded Buffer chunk.
+     * @returns This decoder instance.
+     */
     once(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Adds a listener for decoded flowed text bytes.
+     *
+     * @param event Event name.
+     * @param listener Receives decoded Buffer chunks.
+     * @returns This decoder instance.
+     */
     addListener(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Prepends a listener for decoded flowed text bytes.
+     *
+     * @param event Event name.
+     * @param listener Receives decoded Buffer chunks.
+     * @returns This decoder instance.
+     */
     prependListener(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Emits a decoded flowed text chunk.
+     *
+     * @param event Event name.
+     * @param data Buffer chunk to emit.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'data', data: Buffer): boolean;
@@ -11,0 +57,0 @@ }

lib/flowed-decoder.js

 'use strict';
 
-// Helper class to rewrite nodes with specific mime type
+// Helper class to decode format=flowed text nodes
 
@@ -13,10 +13,9 @@ const Transform = require('stream').Transform;
 /**
- * Really bad "stream" transform to parse format=flowed content
+ * Transform stream that decodes text/plain format=flowed content.
  *
- * @constructor
- * @param {FlowedDecoderOptions} [config]
+ * @param {FlowedDecoderOptions} [config] Flowed text and charset decoding settings.
  */
 class FlowedDecoder extends Transform {
     /**
-     * @param {FlowedDecoderOptions} [config]
+     * @param {FlowedDecoderOptions} [config] Flowed text and charset decoding settings.
      */
@@ -23,0 +22,0 @@ constructor(config) {

lib/headers.d.ts

 import type { DecodedHeader, HeaderLine, LibmimeOptions } from './types';
 
+/** Mutable parser and builder for RFC-style message header blocks. */
 declare class Headers {
+    /** Whether header lines have been modified after construction. */
     changed: boolean;
+
+    /** Original unparsed header source, or `false` when constructed from parsed lines. */
     headers: string | Buffer | false;
+
+    /** Whether `headers` has been parsed into `lines`. */
     parsed: boolean;
+
+    /** Parsed header lines, or `false` until parsing occurs. */
     lines: HeaderLine[] | false;
+
+    /** MBOX `From ` prefix line, or `false` when absent. */
     mbox: string | false;
+
+    /** HTTP request prefix line, or `false` when absent. */
     http: string | false;
 
+    /**
+     * Creates a mutable header collection.
+     *
+     * @param headers Raw header bytes/string, already parsed header lines, or `false` for an empty collection.
+     * @param config Optional libmime configuration.
+     */
     constructor(headers?: string | Buffer | HeaderLine[] | false, config?: LibmimeOptions);
+
+    /**
+     * Checks whether at least one header with the requested key exists.
+     *
+     * @param key Header field name to find, case-insensitively.
+     * @returns `true` when the header exists.
+     */
     hasHeader(key: string): boolean;
+
+    /**
+     * Gets all raw header lines for a key.
+     *
+     * @param key Header field name to find, case-insensitively.
+     * @returns Full decoded header lines, including field names.
+     */
     get(key: string): string[];
+
+    /**
+     * Gets all decoded structured header values for a key.
+     *
+     * @param key Header field name to decode, case-insensitively.
+     * @returns Decoded header entries with key and value fields.
+     */
     getDecoded(key: string): DecodedHeader[];
+
+    /**
+     * Gets the first decoded header value for a key.
+     *
+     * @param key Header field name to find, case-insensitively.
+     * @returns Trimmed decoded value, or an empty string when the header is absent.
+     */
     getFirst(key: string): string;
+
+    /**
+     * Gets the mutable parsed header list.
+     *
+     * @returns Parsed header lines in message order.
+     */
     getList(): HeaderLine[];
+
+    /**
+     * Adds a folded header line.
+     *
+     * @param key Header field name to add.
+     * @param value Header value; `undefined` leaves the collection unchanged.
+     * @param index Insertion index, where omitted or less than 1 inserts at the top.
+     * @returns Nothing.
+     */
     add(key: string, value?: string | number | Buffer, index?: number): void;
+
+    /**
+     * Adds a preformatted header line.
+     *
+     * @param key Header field name used for normalized lookup.
+     * @param line Full header line to insert; falsy values leave the collection unchanged.
+     * @param index Insertion index, where omitted or less than 1 inserts at the top.
+     * @returns Nothing.
+     */
     addFormatted(key: string, line?: string | Buffer | false, index?: number): void;
+
+    /**
+     * Removes all headers matching a key.
+     *
+     * @param key Header field name to remove, case-insensitively.
+     * @returns Nothing.
+     */
     remove(key: string): void;
+
+    /**
+     * Replaces matching headers with a new folded header value.
+     *
+     * @param key Header field name to update.
+     * @param value Header value to write; `undefined` removes matching values without adding a replacement.
+     * @param relativeIndex Optional zero-based index among headers with the same key.
+     * @returns Nothing.
+     */
     update(key: string, value?: string | number | Buffer, relativeIndex?: number): void;
+
+    /**
+     * Builds a raw header block.
+     *
+     * @param lineEnd Line ending to use when rebuilding changed headers; defaults to CRLF.
+     * @returns Header bytes ending with an empty header/body separator line.
+     */
     build(lineEnd?: string | false): Buffer;
@@ -22,0 +115,0 @@ }

lib/headers.js

@@ -12,9 +12,9 @@ 'use strict';
 /**
- * Class Headers to parse and handle message headers. Headers instance allows to
- * check existing, delete or add new headers
+ * Parses and builds message headers. A Headers instance allows callers to
+ * inspect, delete, update, and add header lines.
  */
 class Headers {
     /**
-     * @param {string | Buffer | HeaderLine[] | false} [headers]
-     * @param {LibmimeOptions} [config]
+     * @param {string | Buffer | HeaderLine[] | false} [headers] Raw header source or already parsed lines.
+     * @param {LibmimeOptions} [config] Optional libmime configuration.
      */
@@ -21,0 +21,0 @@ constructor(headers, config) {

lib/message-joiner.d.ts

 import { Transform } from 'node:stream';
 
+/** Transform stream that joins splitter objects back into raw email bytes. */
 declare class MessageJoiner extends Transform {
+    /**
+     * Creates a joiner that accepts splitter objects and emits Buffer chunks.
+     */
     constructor();
+
+    /**
+     * Registers a listener for generated message bytes.
+     *
+     * @param event Event name.
+     * @param listener Receives each generated Buffer chunk.
+     * @returns This joiner instance.
+     */
     on(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Registers a one-time listener for generated message bytes.
+     *
+     * @param event Event name.
+     * @param listener Receives the next generated Buffer chunk.
+     * @returns This joiner instance.
+     */
     once(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Adds a listener for generated message bytes.
+     *
+     * @param event Event name.
+     * @param listener Receives each generated Buffer chunk.
+     * @returns This joiner instance.
+     */
     addListener(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Prepends a listener for generated message bytes.
+     *
+     * @param event Event name.
+     * @param listener Receives each generated Buffer chunk.
+     * @returns This joiner instance.
+     */
     prependListener(event: 'data', listener: (data: Buffer) => void): this;
+
+    /**
+     * Emits a generated message byte chunk.
+     *
+     * @param event Event name.
+     * @param data Buffer chunk to emit.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'data', data: Buffer): boolean;
@@ -10,0 +54,0 @@ }

lib/message-joiner.js

@@ -7,3 +7,9 @@ 'use strict';
 
+/**
+ * Transform stream that joins splitter objects back into raw message bytes.
+ */
 class MessageJoiner extends Transform {
+    /**
+     * Creates a joiner that accepts splitter objects and emits Buffer chunks.
+     */
     constructor() {
@@ -10,0 +16,0 @@ let options = {

lib/message-splitter.d.ts

 import { Transform } from 'node:stream';
 import type { SplitterChunk, SplitterOptions } from './types';
 
+/** Transform stream that splits raw email bytes into MIME node and content chunks. */
 declare class MessageSplitter extends Transform {
+    /**
+     * Creates a splitter that accepts Buffer input and emits `SplitterChunk` objects.
+     *
+     * @param config Optional parser limits and embedded-message behavior.
+     */
     constructor(config?: SplitterOptions);
+
+    /**
+     * Registers a listener for parsed splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each parsed MIME node, data chunk, or body chunk.
+     * @returns This splitter instance.
+     */
     on(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Registers a one-time listener for the next parsed splitter chunk.
+     *
+     * @param event Event name.
+     * @param listener Receives the next parsed MIME node, data chunk, or body chunk.
+     * @returns This splitter instance.
+     */
     once(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Adds a listener for parsed splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each parsed MIME node, data chunk, or body chunk.
+     * @returns This splitter instance.
+     */
     addListener(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Prepends a listener for parsed splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each parsed MIME node, data chunk, or body chunk.
+     * @returns This splitter instance.
+     */
     prependListener(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Emits a parsed splitter chunk.
+     *
+     * @param event Event name.
+     * @param data MIME node, data chunk, or body chunk to emit.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'data', data: SplitterChunk): boolean;
@@ -11,0 +57,0 @@ }

lib/message-splitter.js

@@ -19,2 +19,5 @@ 'use strict';
 
+/**
+ * Transform stream that splits raw email bytes into MIME node and content chunks.
+ */
 class MessageSplitter extends Transform {
@@ -63,3 +66,8 @@ /**
 
-        /** @param {MessageChunk} data */
+        /**
+         * Removes a pending line break from body data that belongs to a following boundary.
+         *
+         * @param {MessageChunk} data Body chunk to adjust in place.
+         * @returns {void}
+         */
         let checkTrailingLinebreak = data => {
@@ -93,2 +101,7 @@ if (data.type === 'body' && data.node.parentNode && data.value && data.value.length) {
 
+        /**
+         * Iterates the current input chunk line by line and emits parsed groups.
+         *
+         * @returns {void}
+         */
         let iterateData = () => {
@@ -95,0 +108,0 @@ for (let len = chunk.length; i < len; i++) {

lib/mime-node.d.ts

 import type { ContentStream, MimeNode as MimeNodeShape, PartNumber, PartNumberItem, SplitterOptions } from './types';
 import type Headers = require('./headers');
 
+/** Parsed MIME node with mutable headers and content encoding helpers. */
 declare class MimeNode implements MimeNodeShape {
+    /** Discriminator identifying this chunk as a MIME node. */
     type: 'node';
+
+    /** Whether this node is the root message node. */
     root: boolean;
+
+    /** Parent MIME node, or `false` for the root node. */
     parentNode: MimeNodeShape | false;
+
+    /** Boundary used by this multipart node, or `false` when not multipart. */
     _boundary: Buffer | false;
+
+    /** Boundary inherited from the parent multipart node, or `false` when absent. */
     _parentBoundary: Buffer | false;
+
+    /** Length, in bytes, of the raw header block collected for this node. */
     _headerlen: number;
+
+    /** Multipart subtype such as `mixed` or `alternative`, or `false` for leaf nodes. */
     multipart: string | false;
+
+    /** Content-Transfer-Encoding value, normalized to lower case, or `false` when absent. */
     encoding: string | false;
+
+    /** Parsed and mutable header collection, available after headers are parsed. */
     headers: Headers | false;
+
+    /** MIME content type such as `text/plain`, or `false` when unavailable. */
     contentType: string | false;
+
+    /** Charset parameter from Content-Type, or `false` when absent. */
     charset: string | false;
+
+    /** Content-Disposition value such as `inline` or `attachment`, or `false` when absent. */
     disposition: string | false;
+
+    /** Decoded filename from Content-Disposition or Content-Type parameters, or `false` when absent. */
     filename: string | false;
+
+    /** Whether this node is `text/*` with `format=flowed`. */
     flowed: boolean;
+
+    /** Whether flowed text uses `delsp=yes`. */
     delSp: boolean;
+
+    /** Splitter configuration used when parsing this node. */
     config: SplitterOptions;
+
+    /** Resolved IMAP-style part number for this node, or `false` before resolution. */
     partNr: PartNumber | false;
+
+    /** Number of child part numbers allocated by this node. */
     childPartNumbers: number;
+
+    /** Whether this node's content type is `message/rfc822`. */
     rfc822: boolean;
+
+    /** Whether an embedded `message/rfc822` node was parsed as a nested message. */
     messageNode?: boolean;
 
+    /**
+     * Creates a MIME node with empty header state.
+     *
+     * @param parentNode Parent node, or `false`/omitted for the root node.
+     * @param config Optional splitter and libmime configuration.
+     */
     constructor(parentNode?: MimeNodeShape | false, config?: SplitterOptions);
+
+    /**
+     * Builds the next child part number for this node.
+     *
+     * @param provided Optional explicit part number item to append.
+     * @returns Resolved MIME part number.
+     */
     getPartNr(provided?: PartNumberItem): PartNumber;
+
+    /**
+     * Appends one raw header line to this node while parsing.
+     *
+     * @param line Raw header line bytes; falsy values are ignored.
+     * @returns Nothing.
+     */
     addHeaderChunk(line?: Buffer | false): void;
+
+    /**
+     * Parses collected header bytes and populates MIME metadata fields.
+     *
+     * @returns Nothing.
+     */
     parseHeaders(): void;
+
+    /**
+     * Builds this node's header block.
+     *
+     * @returns Header bytes ending with an empty header/body separator line.
+     */
     getHeaders(): Buffer;
+
+    /**
+     * Sets or updates the Content-Type header value.
+     *
+     * @param contentType MIME content type to set; falsy keeps the current type.
+     * @returns Nothing.
+     */
     setContentType(contentType?: string | false): void;
+
+    /**
+     * Sets, updates, or removes the Content-Type charset parameter.
+     *
+     * @param charset Charset to set; falsy removes it when possible.
+     * @returns Nothing.
+     */
     setCharset(charset?: string | false): void;
+
+    /**
+     * Sets, updates, or removes the filename parameter.
+     *
+     * @param filename Filename to set; falsy removes it when possible.
+     * @returns Nothing.
+     */
     setFilename(filename?: string | false): void;
+
+    /**
+     * Creates a decoder stream for this node's transfer encoding.
+     *
+     * @returns Transform stream that outputs decoded content bytes.
+     */
     getDecoder(): ContentStream;
+
+    /**
+     * Creates an encoder stream and updates the Content-Transfer-Encoding header when needed.
+     *
+     * @param encoding Target transfer encoding; defaults to the node's current encoding.
+     * @returns Transform stream that outputs encoded content bytes.
+     */
     getEncoder(encoding?: string | false): ContentStream;
@@ -36,0 +142,0 @@ }

lib/mime-node.js

@@ -21,6 +21,9 @@ 'use strict';
 
+/**
+ * Parsed MIME node with mutable headers and transfer-encoding helpers.
+ */
 class MimeNode {
     /**
-     * @param {MimeNodeType | false} parentNode
-     * @param {SplitterOptions} [config]
+     * @param {MimeNodeType | false} parentNode Parent node, or false for the root node.
+     * @param {SplitterOptions} [config] Splitter and libmime configuration.
      */
@@ -27,0 +30,0 @@ constructor(parentNode, config) {

lib/node-rewriter.d.ts

 import { Transform } from 'node:stream';
 import type { FilterFunc, RewriterNode, SplitterChunk } from './types';
 
+/** Transform stream that replaces the body content of selected MIME nodes. */
 declare class NodeRewriter extends Transform {
+    /**
+     * Creates a node rewriter that accepts splitter chunks and emits rewritten splitter chunks.
+     *
+     * @param filterFunc Predicate that selects MIME nodes to rewrite.
+     * @param rewriteAction Optional compatibility hook stored on the instance; consumers usually handle the `node` event.
+     */
     constructor(filterFunc: FilterFunc, rewriteAction?: Function);
+
+    /**
+     * Registers a listener for rewritten splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each outgoing MIME node, data chunk, or body chunk.
+     * @returns This rewriter instance.
+     */
     on(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Registers a listener for selected nodes.
+     *
+     * @param event Event name.
+     * @param listener Receives decoder and encoder streams for a selected node.
+     * @returns This rewriter instance.
+     */
     on(event: 'node', listener: (data: RewriterNode) => void): this;
+
+    /**
+     * Registers a one-time listener for the next rewritten splitter chunk.
+     *
+     * @param event Event name.
+     * @param listener Receives the next outgoing MIME node, data chunk, or body chunk.
+     * @returns This rewriter instance.
+     */
     once(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Registers a one-time listener for the next selected node.
+     *
+     * @param event Event name.
+     * @param listener Receives decoder and encoder streams for the next selected node.
+     * @returns This rewriter instance.
+     */
     once(event: 'node', listener: (data: RewriterNode) => void): this;
+
+    /**
+     * Adds a listener for rewritten splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each outgoing MIME node, data chunk, or body chunk.
+     * @returns This rewriter instance.
+     */
     addListener(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Adds a listener for selected nodes.
+     *
+     * @param event Event name.
+     * @param listener Receives decoder and encoder streams for a selected node.
+     * @returns This rewriter instance.
+     */
     addListener(event: 'node', listener: (data: RewriterNode) => void): this;
+
+    /**
+     * Prepends a listener for rewritten splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each outgoing MIME node, data chunk, or body chunk.
+     * @returns This rewriter instance.
+     */
     prependListener(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Prepends a listener for selected nodes.
+     *
+     * @param event Event name.
+     * @param listener Receives decoder and encoder streams for a selected node.
+     * @returns This rewriter instance.
+     */
     prependListener(event: 'node', listener: (data: RewriterNode) => void): this;
+
+    /**
+     * Emits a rewritten splitter chunk.
+     *
+     * @param event Event name.
+     * @param data MIME node, data chunk, or body chunk to emit.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'data', data: SplitterChunk): boolean;
+
+    /**
+     * Emits a selected-node payload.
+     *
+     * @param event Event name.
+     * @param data Selected node payload containing decoder and encoder streams.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'node', data: RewriterNode): boolean;
@@ -16,0 +103,0 @@ }

lib/node-rewriter.js

@@ -17,12 +17,12 @@ 'use strict';
 /**
- * NodeRewriter Transform stream. Updates content for all nodes with specified mime type
+ * NodeRewriter Transform stream. Updates content for all nodes selected by the
+ * filter function.
  *
- * @constructor
- * @param {FilterFunc} filterFunc Function to select nodes to rewrite
- * @param {Function} [rewriteAction] Function to run with the node content
+ * @param {FilterFunc} filterFunc Function that receives a MIME node and returns true to rewrite it.
+ * @param {Function} [rewriteAction] Optional compatibility hook stored on the instance.
  */
 class NodeRewriter extends Transform {
     /**
-     * @param {FilterFunc} filterFunc
-     * @param {Function} [rewriteAction]
+     * @param {FilterFunc} filterFunc Function that receives a MIME node and returns true to rewrite it.
+     * @param {Function} [rewriteAction] Optional compatibility hook stored on the instance.
      */
@@ -132,2 +132,7 @@ constructor(filterFunc, rewriteAction) {
 
+        /**
+         * Reads encoded replacement bytes and forwards them as body chunks.
+         *
+         * @returns {void | NodeJS.Immediate}
+         */
         let readFromEncoder = () => {
@@ -207,5 +212,14 @@ decoder.$reading = true;
             });
-            flowDecoder.on('error', /** @param {Error} err */ err => {
-                decoder.emit('error', err);
-            });
+            flowDecoder.on(
+                'error',
+                /**
+                 * Forwards flowed decoder errors to the replacement decoder.
+                 *
+                 * @param {Error} err Decoder error to forward.
+                 * @returns {void}
+                 */
+                err => {
+                    decoder.emit('error', err);
+                }
+            );
             flowDecoder.pipe(decoder);
@@ -212,0 +226,0 @@

lib/node-streamer.d.ts

 import { Transform } from 'node:stream';
 import type { FilterFunc, SplitterChunk, StreamerNode } from './types';
 
+/** Transform stream that exposes decoded body streams for selected MIME nodes without replacing them. */
 declare class NodeStreamer extends Transform {
+    /**
+     * Creates a node streamer that accepts splitter chunks and passes them through unchanged.
+     *
+     * @param filterFunc Predicate that selects MIME nodes to stream.
+     * @param streamAction Optional compatibility hook stored on the instance; consumers usually handle the `node` event.
+     */
     constructor(filterFunc: FilterFunc, streamAction?: Function);
+
+    /**
+     * Registers a listener for passed-through splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each outgoing MIME node, data chunk, or body chunk.
+     * @returns This streamer instance.
+     */
     on(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Registers a listener for selected nodes.
+     *
+     * @param event Event name.
+     * @param listener Receives a decoder stream and completion callback for a selected node.
+     * @returns This streamer instance.
+     */
     on(event: 'node', listener: (data: StreamerNode) => void): this;
+
+    /**
+     * Registers a one-time listener for the next passed-through splitter chunk.
+     *
+     * @param event Event name.
+     * @param listener Receives the next outgoing MIME node, data chunk, or body chunk.
+     * @returns This streamer instance.
+     */
     once(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Registers a one-time listener for the next selected node.
+     *
+     * @param event Event name.
+     * @param listener Receives a decoder stream and completion callback for the next selected node.
+     * @returns This streamer instance.
+     */
     once(event: 'node', listener: (data: StreamerNode) => void): this;
+
+    /**
+     * Adds a listener for passed-through splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each outgoing MIME node, data chunk, or body chunk.
+     * @returns This streamer instance.
+     */
     addListener(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Adds a listener for selected nodes.
+     *
+     * @param event Event name.
+     * @param listener Receives a decoder stream and completion callback for a selected node.
+     * @returns This streamer instance.
+     */
     addListener(event: 'node', listener: (data: StreamerNode) => void): this;
+
+    /**
+     * Prepends a listener for passed-through splitter chunks.
+     *
+     * @param event Event name.
+     * @param listener Receives each outgoing MIME node, data chunk, or body chunk.
+     * @returns This streamer instance.
+     */
     prependListener(event: 'data', listener: (data: SplitterChunk) => void): this;
+
+    /**
+     * Prepends a listener for selected nodes.
+     *
+     * @param event Event name.
+     * @param listener Receives a decoder stream and completion callback for a selected node.
+     * @returns This streamer instance.
+     */
     prependListener(event: 'node', listener: (data: StreamerNode) => void): this;
+
+    /**
+     * Emits a passed-through splitter chunk.
+     *
+     * @param event Event name.
+     * @param data MIME node, data chunk, or body chunk to emit.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'data', data: SplitterChunk): boolean;
+
+    /**
+     * Emits a selected-node payload.
+     *
+     * @param event Event name.
+     * @param data Selected node payload containing decoder stream and completion callback.
+     * @returns `true` when the event had listeners.
+     */
     emit(event: 'node', data: StreamerNode): boolean;
@@ -16,0 +103,0 @@ }

lib/node-streamer.js

 'use strict';
 
-// Helper class to rewrite nodes with specific mime type
+// Helper class to stream selected nodes by MIME metadata
 
@@ -16,12 +16,12 @@ const Transform = require('stream').Transform;
 /**
- * NodeRewriter Transform stream. Updates content for all nodes with specified mime type
+ * NodeStreamer Transform stream. Exposes decoded content for nodes selected by
+ * the filter function while passing the original message through unchanged.
  *
- * @constructor
- * @param {FilterFunc} filterFunc Function to select nodes to stream
- * @param {Function} [streamAction] Function to run with the node content
+ * @param {FilterFunc} filterFunc Function that receives a MIME node and returns true to stream it.
+ * @param {Function} [streamAction] Optional compatibility hook stored on the instance.
  */
 class NodeStreamer extends Transform {
     /**
-     * @param {FilterFunc} filterFunc
-     * @param {Function} [streamAction]
+     * @param {FilterFunc} filterFunc Function that receives a MIME node and returns true to stream it.
+     * @param {Function} [streamAction] Optional compatibility hook stored on the instance.
      */
@@ -93,2 +93,7 @@ constructor(filterFunc, streamAction) {
 
+            /**
+             * Resumes processing with the first chunk after the streamed node.
+             *
+             * @returns {void}
+             */
             let doContinue = () => {
@@ -135,5 +140,14 @@ this.continue = false;
             });
-            flowDecoder.on('error', /** @param {Error} err */ err => {
-                decoder.emit('error', err);
-            });
+            flowDecoder.on(
+                'error',
+                /**
+                 * Forwards flowed decoder errors to the output decoder.
+                 *
+                 * @param {Error} err Decoder error to forward.
+                 * @returns {void}
+                 */
+                err => {
+                    decoder.emit('error', err);
+                }
+            );
             flowDecoder.pipe(decoder);
@@ -145,2 +159,7 @@ }
             decoder,
+            /**
+             * Marks the selected node stream as consumed so the passthrough can continue.
+             *
+             * @returns {void}
+             */
             done: () => {
@@ -147,0 +166,0 @@ if (typeof this.continue === 'function') {

lib/types.d.ts

 import type { PassThrough, Transform } from 'node:stream';
 import type Headers = require('./headers');
 
+/** Value that is either present as `T` or explicitly unavailable as `false`. */
 export type Maybe<T> = T | false;
+
+/** Single item in an IMAP-style MIME part number. */
 export type PartNumberItem = number | 'TEXT';
+
+/** IMAP-style path to a MIME part, for example `[1, 2, 'TEXT']`. */
 export type PartNumber = PartNumberItem[];
 
+/** Options passed through to libmime instances created by this package. */
 export interface LibmimeOptions {
+    /** Optional iconv-compatible implementation used by libmime for charset conversion. */
     Iconv?: unknown;
 }
 
+/** Configuration for `MessageSplitter` and MIME node parsing. */
 export interface SplitterOptions extends LibmimeOptions {
+    /** Treat `message/rfc822` parts as leaf nodes instead of parsing embedded messages. */
     ignoreEmbedded?: boolean;
+
+    /** Parse embedded messages as inline unless their disposition is `attachment`. */
     defaultInlineEmbedded?: boolean;
+
+    /** Maximum header block size, in bytes, allowed for a single MIME node. */
     maxHeadSize?: number;
+
+    /** Maximum number of MIME child nodes accepted before parsing fails. */
     maxChildNodes?: number;
 }
 
+/** Configuration for `ChunkedPassthrough`. */
 export interface ChunkedPassthroughOptions {
+    /** Buffered byte threshold for non-final chunks. Defaults to 64 KiB. */
     chunkSize?: number;
 }
 
+/** Configuration for `FlowedDecoder`. */
 export interface FlowedDecoderOptions extends LibmimeOptions {
+    /** Whether format=flowed uses RFC 3676 `DelSp=yes` space deletion semantics. */
     delSp?: boolean;
+
+    /** Source Content-Transfer-Encoding hint used during format=flowed handling. */
     encoding?: string | false;
 }
 
+/** Parsed raw header line with a normalized lookup key. */
 export interface HeaderLine {
+    /** Lower-case header key used for comparisons and lookups. */
     key: string;
+
+    /** Full header line, including the original field name, value, and any folded continuations. */
     line: string;
 }
 
+/** Decoded structured header value returned by libmime. */
 export interface DecodedHeader {
+    /** Header key returned by libmime for the decoded value. */
     key: string;
+
+    /** Unicode decoded header value. */
     value: string;
 }
 
+/** MIME node emitted by `MessageSplitter` and accepted by `MessageJoiner`. */
 export interface MimeNode {
+    /** Discriminator identifying this chunk as a MIME node. */
     type: 'node';
+
+    /** Whether this node is the root message node. */
     root: boolean;
+
+    /** Parent MIME node, or `false` for the root node. */
     parentNode: MimeNode | false;
+
+    /** Boundary used by this multipart node, or `false` when not multipart. */
     _boundary: Buffer | false;
+
+    /** Boundary inherited from the parent multipart node, or `false` when absent. */
     _parentBoundary: Buffer | false;
+
+    /** Length, in bytes, of the raw header block collected for this node. */
     _headerlen: number;
+
+    /** Multipart subtype such as `mixed` or `alternative`, or `false` for leaf nodes. */
     multipart: string | false;
+
+    /** Content-Transfer-Encoding value, normalized to lower case, or `false` when absent. */
     encoding: string | false;
+
+    /** Parsed and mutable header collection, available after headers are parsed. */
     headers: Headers | false;
+
+    /** MIME content type such as `text/plain`, or `false` when unavailable. */
     contentType: string | false;
+
+    /** Charset parameter from Content-Type, or `false` when absent. */
     charset: string | false;
+
+    /** Content-Disposition value such as `inline` or `attachment`, or `false` when absent. */
     disposition: string | false;
+
+    /** Decoded filename from Content-Disposition or Content-Type parameters, or `false` when absent. */
     filename: string | false;
+
+    /** Whether this node is `text/*` with `format=flowed`. */
     flowed: boolean;
+
+    /** Whether flowed text uses `delsp=yes`. */
     delSp: boolean;
+
+    /** Splitter configuration used when parsing this node. */
     config: SplitterOptions;
+
+    /** Resolved IMAP-style part number for this node, or `false` before resolution. */
     partNr: PartNumber | false;
+
+    /** Number of child part numbers allocated by this node. */
     childPartNumbers: number;
+
+    /** Whether this node's content type is `message/rfc822`. */
     rfc822: boolean;
+
+    /** Whether an embedded `message/rfc822` node was parsed as a nested message. */
     messageNode?: boolean;
 
+    /**
+     * Builds the next child part number for this node.
+     *
+     * @param provided Optional explicit part number item to append.
+     * @returns Resolved MIME part number.
+     */
     getPartNr(provided?: PartNumberItem): PartNumber;
+
+    /**
+     * Appends one raw header line to this node while parsing.
+     *
+     * @param line Raw header line bytes; falsy values are ignored.
+     * @returns Nothing.
+     */
     addHeaderChunk(line?: Buffer | false): void;
+
+    /**
+     * Parses collected header bytes and populates MIME metadata fields.
+     *
+     * @returns Nothing.
+     */
     parseHeaders(): void;
+
+    /**
+     * Builds this node's header block.
+     *
+     * @returns Header bytes ending with an empty header/body separator line.
+     */
     getHeaders(): Buffer;
+
+    /**
+     * Sets or updates the Content-Type header value.
+     *
+     * @param contentType MIME content type to set; falsy keeps the current type.
+     * @returns Nothing.
+     */
     setContentType(contentType?: string | false): void;
+
+    /**
+     * Sets, updates, or removes the Content-Type charset parameter.
+     *
+     * @param charset Charset to set; falsy removes it when possible.
+     * @returns Nothing.
+     */
     setCharset(charset?: string | false): void;
+
+    /**
+     * Sets, updates, or removes the filename parameter.
+     *
+     * @param filename Filename to set; falsy removes it when possible.
+     * @returns Nothing.
+     */
     setFilename(filename?: string | false): void;
+
+    /**
+     * Creates a decoder stream for this node's transfer encoding.
+     *
+     * @returns Transform stream that outputs decoded content bytes.
+     */
     getDecoder(): Transform | PassThrough;
+
+    /**
+     * Creates an encoder stream and updates the Content-Transfer-Encoding header when needed.
+     *
+     * @param encoding Target transfer encoding; defaults to the node's current encoding.
+     * @returns Transform stream that outputs encoded content bytes.
+     */
     getEncoder(encoding?: string | false): Transform | PassThrough;
 }
 
+/** Data or body bytes emitted by `MessageSplitter`. */
 export interface MessageChunk {
+    /** MIME node that owns or precedes this chunk. */
     node: MimeNode;
+
+    /** Chunk kind: multipart structure bytes (`data`) or leaf content bytes (`body`). */
     type: 'data' | 'body';
+
+    /** Raw chunk bytes. */
     value: Buffer;
 }
 
+/** Sentinel input used internally to finish a pending rewriter or streamer node. */
 export interface EmptyChunk {
+    /** Discriminator for an empty control chunk. */
     type: 'none';
 }
 
+/** Object emitted by `MessageSplitter`: either a MIME node or a data/body byte chunk. */
 export type SplitterChunk = MimeNode | MessageChunk;
+
+/** Object accepted by rewriter and streamer transforms. */
 export type RewriterInput = SplitterChunk | EmptyChunk;
+
+/**
+ * Predicate used to select MIME nodes.
+ *
+ * @param node MIME node being inspected.
+ * @returns `true` to process the node, otherwise `false`.
+ */
 export type FilterFunc = (node: MimeNode) => boolean;
+
+/** Error object that may include a Node-style string error code. */
 export type ErrorWithCode = Error & { code?: string };
+
+/**
+ * Callback that resumes processing after a selected node stream has ended.
+ *
+ * @returns Nothing.
+ */
 export type ContinueCallback = () => void;
+
+/** Content transform stream used for decoded or encoded node bodies. */
 export type ContentStream = Transform | PassThrough;
+
+/** Decoder stream with an internal readable-state guard used by rewriter/streamer. */
 export type DecoderStream = ContentStream & { $reading?: boolean };
 
+/** Internal grouping state used while splitter coalesces adjacent chunks. */
 export interface SplitterGroup {
+    /** MIME node associated with the group, when one exists. */
     node?: MimeNode;
+
+    /** Group kind currently being accumulated. */
     type: 'none' | 'node' | 'data' | 'body';
+
+    /** Buffered raw bytes for `data` or `body` groups. */
     value?: Buffer;
 }
 
+/** Payload emitted with `NodeRewriter`'s `node` event. */
 export interface RewriterNode {
+    /** Selected MIME node whose body can be rewritten. */
     node: MimeNode;
+
+    /** Stream that yields decoded original body bytes. */
     decoder: Transform;
+
+    /** Stream that accepts replacement decoded bytes and emits properly encoded body bytes. */
     encoder: Transform;
 }
 
+/** Payload emitted with `NodeStreamer`'s `node` event. */
 export interface StreamerNode {
+    /** Selected MIME node whose body is being streamed. */
     node: MimeNode;
+
+    /** Stream that yields decoded original body bytes. */
     decoder: Transform;
+
+    /**
+     * Signals that the consumer has finished reading the selected node.
+     *
+     * @returns Nothing.
+     */
     done: () => void;
 }

package.json

 {
     "name": "@zone-eu/mailsplit",
-    "version": "5.4.10",
+    "version": "5.4.11",
     "description": "Split email messages into an object stream",
@@ -5,0 +5,0 @@ "main": "index.js",

No alert changes

Improved metrics

Total package byte prevSize

120715

30.43%

Lines of code

2478

38.51%

No dependency changes