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test-source-map-api.js
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test-source-map-api.js
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// Flags: --enable-source-maps
'use strict';
require('../common');
const assert = require('assert');
const { findSourceMap, SourceMap } = require('module');
const { readFileSync } = require('fs');
// findSourceMap() can lookup source-maps based on URIs, in the
// non-exceptional case.
{
require('../fixtures/source-map/disk-relative-path.js');
const sourceMap = findSourceMap(
require.resolve('../fixtures/source-map/disk-relative-path.js')
);
const {
originalLine,
originalColumn,
originalSource
} = sourceMap.findEntry(0, 29);
assert.strictEqual(originalLine, 2);
assert.strictEqual(originalColumn, 4);
assert(originalSource.endsWith('disk.js'));
}
// findSourceMap() can be used in Error.prepareStackTrace() to lookup
// source-map attached to error.
{
let callSite;
let sourceMap;
Error.prepareStackTrace = (error, trace) => {
const throwingRequireCallSite = trace[0];
if (throwingRequireCallSite.getFileName().endsWith('typescript-throw.js')) {
sourceMap = findSourceMap(throwingRequireCallSite.getFileName(), error);
callSite = throwingRequireCallSite;
}
};
try {
// Require a file that throws an exception, and has a source map.
require('../fixtures/source-map/typescript-throw.js');
} catch (err) {
err.stack; // Force prepareStackTrace() to be called.
}
assert(callSite);
assert(sourceMap);
const {
generatedLine,
generatedColumn,
originalLine,
originalColumn,
originalSource
} = sourceMap.findEntry(
callSite.getLineNumber() - 1,
callSite.getColumnNumber() - 1
);
assert.strictEqual(generatedLine, 19);
assert.strictEqual(generatedColumn, 14);
assert.strictEqual(originalLine, 17);
assert.strictEqual(originalColumn, 10);
assert(originalSource.endsWith('typescript-throw.ts'));
}
// SourceMap can be instantiated with Source Map V3 object as payload.
{
const payload = JSON.parse(readFileSync(
require.resolve('../fixtures/source-map/disk.map'), 'utf8'
));
const sourceMap = new SourceMap(payload);
const {
originalLine,
originalColumn,
originalSource
} = sourceMap.findEntry(0, 29);
assert.strictEqual(originalLine, 2);
assert.strictEqual(originalColumn, 4);
assert(originalSource.endsWith('disk.js'));
// The stored payload should be a clone:
assert.strictEqual(payload.mappings, sourceMap.payload.mappings);
assert.notStrictEqual(payload, sourceMap.payload);
assert.strictEqual(payload.sources[0], sourceMap.payload.sources[0]);
assert.notStrictEqual(payload.sources, sourceMap.payload.sources);
}