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react-native-devtools-frontend/node_modules/sourcemap-codec
Tim van der Lippe 6d109a9d45 Update Mocha to 8.3.0
This also adds Python-2.0 to the list of accepted licenses.

Lastly, it fixes a bug where the package.json files were incorrectly
reordered. For the `exports` of a particular package, the order that
the entrypoints are defined in is crucial. Therefore, we should not
alter the order of entrypoints and instead maintain the originally
defined ordering. We can use an `OrderedDict` to ensure that Python
always loads the JSON files in the same order.

DISABLE_THIRD_PARTY_CHECK=NPM update
R=jacktfranklin@chromium.org

Bug: none
Change-Id: I5a309782de6015edea6ba3b502aa0db1f008d973
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2692909
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
2021-02-17 12:08:49 +00:00
..
2021-02-17 12:08:49 +00:00

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' );

License

MIT