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@jridgewell/sourcemap-codec

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@jridgewell/sourcemap-codec

Encode/decode sourcemap mappings

    1.4.14latest

Version published
Maintainers
1
Weekly downloads
21,563,540
increased by3.82%

Weekly downloads

Readme

Source

sourcemap-codec

Encode/decode the mappings property of a sourcemap.

Why?

Sourcemaps are difficult to generate and manipulate, because the mappings property – the part that actually links the generated code back to the original source – is encoded using an obscure method called Variable-length quantity. On top of that, each segment in the mapping contains offsets rather than absolute indices, which means that you can't look at a segment in isolation – you have to understand the whole sourcemap.

This package makes the process slightly easier.

Installation

npm install sourcemap-codec

Usage

import { encode, decode } from 'sourcemap-codec'; var decoded = decode( ';EAEEA,EAAE,EAAC,CAAE;ECQY,UACC' ); assert.deepEqual( decoded, [ // the first line (of the generated code) has no mappings, // as shown by the starting semi-colon (which separates lines) [], // the second line contains four (comma-separated) segments [ // segments are encoded as you'd expect: // [ generatedCodeColumn, sourceIndex, sourceCodeLine, sourceCodeColumn, nameIndex ] // i.e. the first segment begins at column 2, and maps back to the second column // of the second line (both zero-based) of the 0th source, and uses the 0th // name in the `map.names` array [ 2, 0, 2, 2, 0 ], // the remaining segments are 4-length rather than 5-length, // because they don't map a name [ 4, 0, 2, 4 ], [ 6, 0, 2, 5 ], [ 7, 0, 2, 7 ] ], // the final line contains two segments [ [ 2, 1, 10, 19 ], [ 12, 1, 11, 20 ] ] ]); var encoded = encode( decoded ); assert.equal( encoded, ';EAEEA,EAAE,EAAC,CAAE;ECQY,UACC' );

Benchmarks

node v18.0.0 amp.js.map - 45120 segments Decode Memory Usage: @jridgewell/sourcemap-codec 5479160 bytes sourcemap-codec 5659336 bytes source-map-0.6.1 17144440 bytes source-map-0.8.0 6867424 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 502 ops/sec ±1.03% (90 runs sampled) decode: sourcemap-codec x 445 ops/sec ±0.97% (92 runs sampled) decode: source-map-0.6.1 x 36.01 ops/sec ±1.64% (49 runs sampled) decode: source-map-0.8.0 x 367 ops/sec ±0.04% (95 runs sampled) Fastest is decode: @jridgewell/sourcemap-codec Encode Memory Usage: @jridgewell/sourcemap-codec 1261620 bytes sourcemap-codec 9119248 bytes source-map-0.6.1 8968560 bytes source-map-0.8.0 8952952 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 738 ops/sec ±0.42% (98 runs sampled) encode: sourcemap-codec x 238 ops/sec ±0.73% (88 runs sampled) encode: source-map-0.6.1 x 162 ops/sec ±0.43% (84 runs sampled) encode: source-map-0.8.0 x 191 ops/sec ±0.34% (90 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec *** babel.min.js.map - 347793 segments Decode Memory Usage: @jridgewell/sourcemap-codec 35338184 bytes sourcemap-codec 35922736 bytes source-map-0.6.1 62366360 bytes source-map-0.8.0 44337416 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 40.35 ops/sec ±4.47% (54 runs sampled) decode: sourcemap-codec x 36.76 ops/sec ±3.67% (51 runs sampled) decode: source-map-0.6.1 x 4.44 ops/sec ±2.15% (16 runs sampled) decode: source-map-0.8.0 x 59.35 ops/sec ±0.05% (78 runs sampled) Fastest is decode: source-map-0.8.0 Encode Memory Usage: @jridgewell/sourcemap-codec 7212604 bytes sourcemap-codec 21421456 bytes source-map-0.6.1 25286888 bytes source-map-0.8.0 25498744 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 112 ops/sec ±0.13% (84 runs sampled) encode: sourcemap-codec x 30.23 ops/sec ±2.76% (53 runs sampled) encode: source-map-0.6.1 x 19.43 ops/sec ±3.70% (37 runs sampled) encode: source-map-0.8.0 x 19.40 ops/sec ±3.26% (37 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec *** preact.js.map - 1992 segments Decode Memory Usage: @jridgewell/sourcemap-codec 500272 bytes sourcemap-codec 516864 bytes source-map-0.6.1 1596672 bytes source-map-0.8.0 517272 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 16,137 ops/sec ±0.17% (99 runs sampled) decode: sourcemap-codec x 12,139 ops/sec ±0.13% (99 runs sampled) decode: source-map-0.6.1 x 1,264 ops/sec ±0.12% (100 runs sampled) decode: source-map-0.8.0 x 9,894 ops/sec ±0.08% (101 runs sampled) Fastest is decode: @jridgewell/sourcemap-codec Encode Memory Usage: @jridgewell/sourcemap-codec 321026 bytes sourcemap-codec 830832 bytes source-map-0.6.1 586608 bytes source-map-0.8.0 586680 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 19,876 ops/sec ±0.78% (95 runs sampled) encode: sourcemap-codec x 6,983 ops/sec ±0.15% (100 runs sampled) encode: source-map-0.6.1 x 5,070 ops/sec ±0.12% (102 runs sampled) encode: source-map-0.8.0 x 5,641 ops/sec ±0.17% (100 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec *** react.js.map - 5726 segments Decode Memory Usage: @jridgewell/sourcemap-codec 734848 bytes sourcemap-codec 954200 bytes source-map-0.6.1 2276432 bytes source-map-0.8.0 955488 bytes Smallest memory usage is @jridgewell/sourcemap-codec Decode speed: decode: @jridgewell/sourcemap-codec x 5,723 ops/sec ±0.12% (98 runs sampled) decode: sourcemap-codec x 4,555 ops/sec ±0.09% (101 runs sampled) decode: source-map-0.6.1 x 437 ops/sec ±0.11% (93 runs sampled) decode: source-map-0.8.0 x 3,441 ops/sec ±0.15% (100 runs sampled) Fastest is decode: @jridgewell/sourcemap-codec Encode Memory Usage: @jridgewell/sourcemap-codec 638672 bytes sourcemap-codec 1109840 bytes source-map-0.6.1 1321224 bytes source-map-0.8.0 1324448 bytes Smallest memory usage is @jridgewell/sourcemap-codec Encode speed: encode: @jridgewell/sourcemap-codec x 6,801 ops/sec ±0.48% (98 runs sampled) encode: sourcemap-codec x 2,533 ops/sec ±0.13% (101 runs sampled) encode: source-map-0.6.1 x 2,248 ops/sec ±0.08% (100 runs sampled) encode: source-map-0.8.0 x 2,303 ops/sec ±0.15% (100 runs sampled) Fastest is encode: @jridgewell/sourcemap-codec

License

MIT

Keywords

FAQs

What is @jridgewell/sourcemap-codec?

Encode/decode sourcemap mappings

Is @jridgewell/sourcemap-codec popular?

The npm package @jridgewell/sourcemap-codec receives a total of 20,666,188 weekly downloads. As such, @jridgewell/sourcemap-codec popularity was classified as popular.

Is @jridgewell/sourcemap-codec well maintained?

We found that @jridgewell/sourcemap-codec demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago.It has 1 open source maintainer collaborating on the project.

Last updated on 26 Jun 2022
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