@observablehq/stdlib - npm Package Compare versions

Comparing version 3.15.7 to 3.16.0

dist/stdlib.js

@@ -1,2 +0,2 @@
-// @observablehq/stdlib v3.15.7 Copyright 2022 Observable, Inc.
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package.json

 {
   "name": "@observablehq/stdlib",
-  "version": "3.15.7",
+  "version": "3.16.0",
   "license": "ISC",
@@ -5,0 +5,0 @@ "main": "dist/stdlib.js",

README.md

@@ -411,21 +411,4 @@ # @observablehq/stdlib
 
-Returns a [*FileAttachment*](#FileAttachment) function given the specified *resolve* function. The *resolve* function is an async function that takes a *name* and returns a URL at which the file of that name can be loaded. For example:
+Returns a [*FileAttachment*](#FileAttachment) function given the specified *resolve* function. The *resolve* function is a function that takes a *name* and returns either an object {url, mimeType} representing the requested file if it exists, or null if the file does not exist. The url field (though not the object itself!) may be represented as a Promise if the URL is not yet known, such as for a file that is currently being uploaded. The mimeType must be a string, or undefined if the mime type is not known. For backwards compatibility, the *resolve* function may instead return just a URL, either a string or a promise.
 
-```js
-const FileAttachment = FileAttachments((name) =>
-  `https://my.server/notebooks/demo/${name}`
-);
-```
-
-Or, with a more complex example, calling an API to produce temporary URLs:
-
-```js
-const FileAttachment = FileAttachments(async (name) =>
-  if (cachedUrls.has(name)) return cachedUrls.get(name);
-  const url = await fetchSignedFileUrl(notebookId, name);
-  cachedUrls.set(name, url);
-  return url;
-);
-```
-
 ### Generators
@@ -432,0 +415,0 @@

src/fileAttachment.js

@@ -21,4 +21,5 @@ import {autoType, csvParse, csvParseRows, tsvParse, tsvParseRows} from "d3-dsv";
 export class AbstractFile {
-  constructor(name) {
+  constructor(name, mimeType) {
     Object.defineProperty(this, "name", {value: name, enumerable: true});
+    if (mimeType !== undefined) Object.defineProperty(this, "mimeType", {value: mimeType + "", enumerable: true});
   }
@@ -83,4 +84,4 @@ async blob() {
 class FileAttachment extends AbstractFile {
-  constructor(url, name) {
-    super(name);
+  constructor(url, name, mimeType) {
+    super(name, mimeType);
     Object.defineProperty(this, "_url", {value: url});
@@ -100,5 +101,9 @@ }
     name => {
-      const url = resolve(name += ""); // Returns a Promise, string, or null.
-      if (url == null) throw new Error(`File not found: ${name}`);
-      return new FileAttachment(url, name);
+      const result = resolve(name += "");
+      if (result == null) throw new Error(`File not found: ${name}`);
+      if (typeof result === "object" && "url" in result) {
+        const {url, mimeType} = result;
+        return new FileAttachment(url, name, mimeType);
+      }
+      return new FileAttachment(result, name);
     },
@@ -105,0 +110,0 @@ {prototype: FileAttachment.prototype} // instanceof

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103305

increased by0.42%

Lines of code

1047

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decreased by-33.33%

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