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process: add lineLength to source-map-cache
Without the line lengths of in-memory transpiled source, it's not possible to convert from byte ofsets to line/column offsets. PR-URL: #29863 Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: David Carlier <[email protected]> Reviewed-By: James M Snell <[email protected]>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,52 @@ | ||
'use strict'; | ||
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const debug = require('internal/util/debuglog').debuglog('source_map'); | ||
const { findSourceMap } = require('internal/source_map/source_map_cache'); | ||
const { overrideStackTrace } = require('internal/errors'); | ||
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// Create a prettified stacktrace, inserting context from source maps | ||
// if possible. | ||
const ErrorToString = Error.prototype.toString; // Capture original toString. | ||
const prepareStackTrace = (globalThis, error, trace) => { | ||
// API for node internals to override error stack formatting | ||
// without interfering with userland code. | ||
// TODO(bcoe): add support for source-maps to repl. | ||
if (overrideStackTrace.has(error)) { | ||
const f = overrideStackTrace.get(error); | ||
overrideStackTrace.delete(error); | ||
return f(error, trace); | ||
} | ||
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const { SourceMap } = require('internal/source_map/source_map'); | ||
const errorString = ErrorToString.call(error); | ||
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if (trace.length === 0) { | ||
return errorString; | ||
} | ||
const preparedTrace = trace.map((t, i) => { | ||
let str = i !== 0 ? '\n at ' : ''; | ||
str = `${str}${t}`; | ||
try { | ||
const sourceMap = findSourceMap(t.getFileName(), error); | ||
if (sourceMap && sourceMap.data) { | ||
const sm = new SourceMap(sourceMap.data); | ||
// Source Map V3 lines/columns use zero-based offsets whereas, in | ||
// stack traces, they start at 1/1. | ||
const [, , url, line, col] = | ||
sm.findEntry(t.getLineNumber() - 1, t.getColumnNumber() - 1); | ||
if (url && line !== undefined && col !== undefined) { | ||
str += | ||
`\n -> ${url.replace('file://', '')}:${line + 1}:${col + 1}`; | ||
} | ||
} | ||
} catch (err) { | ||
debug(err.stack); | ||
} | ||
return str; | ||
}); | ||
return `${errorString}\n at ${preparedTrace.join('')}`; | ||
}; | ||
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module.exports = { | ||
prepareStackTrace, | ||
}; |
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