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Handle "simple" (missing origin) source mappings in minifier output #928

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Handle "simple" (missing origin) source mappings in minifier output #928

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12 changes: 0 additions & 12 deletions packages/metro-source-map/src/__tests__/__snapshots__/source-map-test.js.snap
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Expand Up @@ -8,10 +8,6 @@ Array [
"line": 1,
},
"name": null,
"original": Object {
"column": null,
"line": null,
},
"source": null,
},
Object {
Expand Down Expand Up @@ -56,10 +52,6 @@ Array [
"line": 12,
},
"name": null,
"original": Object {
"column": null,
"line": null,
},
"source": null,
},
Object {
Expand All @@ -80,10 +72,6 @@ Array [
"line": 25,
},
"name": null,
"original": Object {
"column": null,
"line": null,
},
"source": null,
},
Object {
Expand Down
59 changes: 42 additions & 17 deletions packages/metro-source-map/src/source-map.js
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Expand Up @@ -4,7 +4,7 @@
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
* @flow strict-local
* @format
* @oncall react_native
*/
Expand All @@ -21,6 +21,7 @@ const Consumer = require('./Consumer');
const normalizeSourcePath = require('./Consumer/normalizeSourcePath');
const {generateFunctionMap} = require('./generateFunctionMap');
const Generator = require('./Generator');
// $FlowFixMe[untyped-import] - source-map
const SourceMap = require('source-map');

export type {IConsumer};
Expand Down Expand Up @@ -85,6 +86,15 @@ export type IndexMap = {

export type MixedSourceMap = IndexMap | BasicSourceMap;

type SourceMapConsumerMapping = {
generatedLine: number,
generatedColumn: number,
originalLine: ?number,
originalColumn: ?number,
source: ?string,
name: ?string,
};

function fromRawMappingsImpl(
isBlocking: boolean,
onDone: Generator => void,
Expand Down Expand Up @@ -205,20 +215,33 @@ function toBabelSegments(
): Array<BabelSourceMapSegment> {
const rawMappings: Array<BabelSourceMapSegment> = [];

new SourceMap.SourceMapConsumer(sourceMap).eachMapping(map => {
rawMappings.push({
generated: {
line: map.generatedLine,
column: map.generatedColumn,
},
original: {
line: map.originalLine,
column: map.originalColumn,
},
source: map.source,
name: map.name,
});
});
new SourceMap.SourceMapConsumer(sourceMap).eachMapping(
(map: SourceMapConsumerMapping) => {
rawMappings.push(
map.originalLine == null || map.originalColumn == null
? {
generated: {
line: map.generatedLine,
column: map.generatedColumn,
},
source: map.source,
name: map.name,
}
: {
generated: {
line: map.generatedLine,
column: map.generatedColumn,
},
original: {
line: map.originalLine,
column: map.originalColumn,
},
source: map.source,
name: map.name,
},
);
},
);

return rawMappings;
}
Expand Down Expand Up @@ -274,11 +297,13 @@ function addMapping(
if (n === 2) {
generator.addSimpleMapping(line, column);
} else if (n === 4) {
const sourceMap: SourceMapping = (mapping: any);
// $FlowIssue[invalid-tuple-arity] Arity is ensured by conidition on length
const sourceMap: SourceMapping = mapping;

generator.addSourceMapping(line, column, sourceMap[2], sourceMap[3]);
} else if (n === 5) {
const sourceMap: SourceMappingWithName = (mapping: any);
// $FlowIssue[invalid-tuple-arity] Arity is ensured by conidition on length
const sourceMap: SourceMappingWithName = mapping;

generator.addNamedSourceMapping(
line,
Expand Down