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const {
ArrayPrototypeIndexOf,
ArrayPrototypeJoin,
ArrayPrototypeMap,
ErrorPrototypeToString,
StringPrototypeRepeat,
StringPrototypeSlice,
StringPrototypeSplit,
StringPrototypeStartsWith,
SafeStringIterator,
} = primordials;
let debug = require('internal/util/debuglog').debuglog('source_map', (fn) => {
debug = fn;
});
const { getStringWidth } = require('internal/util/inspect');
const { readFileSync } = require('fs');
const { findSourceMap } = require('internal/source_map/source_map_cache');
const {
kNoOverride,
overrideStackTrace,
maybeOverridePrepareStackTrace,
kIsNodeError,
} = require('internal/errors');
const { fileURLToPath } = require('internal/url');
// Create a prettified stacktrace, inserting context from source maps
// if possible.
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);
}
const globalOverride =
maybeOverridePrepareStackTrace(globalThis, error, trace);
if (globalOverride !== kNoOverride) return globalOverride;
let errorString;
if (kIsNodeError in error) {
errorString = `${error.name} [${error.code}]: ${error.message}`;
} else {
errorString = ErrorPrototypeToString(error);
}
if (trace.length === 0) {
return errorString;
}
let errorSource = '';
let lastSourceMap;
let lastFileName;
const preparedTrace = ArrayPrototypeJoin(ArrayPrototypeMap(trace, (t, i) => {
const str = i !== 0 ? '\n at ' : '';
try {
// A stack trace will often have several call sites in a row within the
// same file, cache the source map and file content accordingly:
const fileName = t.getFileName();
const sm = fileName === lastFileName ?
lastSourceMap :
findSourceMap(fileName);
lastSourceMap = sm;
lastFileName = fileName;
if (sm) {
// Source Map V3 lines/columns start at 0/0 whereas stack traces
// start at 1/1:
const {
originalLine,
originalColumn,
originalSource,
} = sm.findEntry(t.getLineNumber() - 1, t.getColumnNumber() - 1);
if (originalSource && originalLine !== undefined &&
originalColumn !== undefined) {
const name = getOriginalSymbolName(sm, trace, i);
if (i === 0) {
errorSource = getErrorSource(
sm,
originalSource,
originalLine,
originalColumn
);
}
// Construct call site name based on: v8.dev/docs/stack-trace-api:
const fnName = t.getFunctionName() ?? t.getMethodName();
const typeName = t.getTypeName();
const namePrefix = typeName !== null && typeName !== 'global' ? `${typeName}.` : '';
const originalName = `${namePrefix}${fnName || '<anonymous>'}`;
// The original call site may have a different symbol name
// associated with it, use it:
const prefix = (name && name !== originalName) ?
`${name}` :
`${originalName}`;
const hasName = !!(name || originalName);
const originalSourceNoScheme =
StringPrototypeStartsWith(originalSource, 'file://') ?
fileURLToPath(originalSource) : originalSource;
// Replace the transpiled call site with the original:
return `${str}${prefix}${hasName ? ' (' : ''}` +
`${originalSourceNoScheme}:${originalLine + 1}:` +
`${originalColumn + 1}${hasName ? ')' : ''}`;
}
}
} catch (err) {
debug(err);
}
return `${str}${t}`;
}), '');
return `${errorSource}${errorString}\n at ${preparedTrace}`;
};
// Transpilers may have removed the original symbol name used in the stack
// trace, if possible restore it from the names field of the source map:
function getOriginalSymbolName(sourceMap, trace, curIndex) {
// First check for a symbol name associated with the enclosing function:
const enclosingEntry = sourceMap.findEntry(
trace[curIndex].getEnclosingLineNumber() - 1,
trace[curIndex].getEnclosingColumnNumber() - 1
);
if (enclosingEntry.name) return enclosingEntry.name;
// Fallback to using the symbol name attached to the next stack frame:
const currentFileName = trace[curIndex].getFileName();
const nextCallSite = trace[curIndex + 1];
if (nextCallSite && currentFileName === nextCallSite.getFileName()) {
const { name } = sourceMap.findEntry(
nextCallSite.getLineNumber() - 1,
nextCallSite.getColumnNumber() - 1
);
return name;
}
}
// Places a snippet of code from where the exception was originally thrown
// above the stack trace. This logic is modeled after GetErrorSource in
// node_errors.cc.
function getErrorSource(
sourceMap,
originalSourcePath,
originalLine,
originalColumn
) {
let exceptionLine = '';
const originalSourcePathNoScheme =
StringPrototypeStartsWith(originalSourcePath, 'file://') ?
fileURLToPath(originalSourcePath) : originalSourcePath;
const source = getOriginalSource(
sourceMap.payload,
originalSourcePathNoScheme
);
const lines = StringPrototypeSplit(source, /\r?\n/, originalLine + 1);
const line = lines[originalLine];
if (!line) return exceptionLine;
// Display ^ in appropriate position, regardless of whether tabs or
// spaces are used:
let prefix = '';
for (const character of new SafeStringIterator(
StringPrototypeSlice(line, 0, originalColumn + 1))) {
prefix += character === '\t' ? '\t' :
StringPrototypeRepeat(' ', getStringWidth(character));
}
prefix = StringPrototypeSlice(prefix, 0, -1); // The last character is '^'.
exceptionLine =
`${originalSourcePathNoScheme}:${originalLine + 1}\n${line}\n${prefix}^\n\n`;
return exceptionLine;
}
function getOriginalSource(payload, originalSourcePath) {
let source;
const originalSourcePathNoScheme =
StringPrototypeStartsWith(originalSourcePath, 'file://') ?
fileURLToPath(originalSourcePath) : originalSourcePath;
const sourceContentIndex =
ArrayPrototypeIndexOf(payload.sources, originalSourcePath);
if (payload.sourcesContent?.[sourceContentIndex]) {
// First we check if the original source content was provided in the
// source map itself:
source = payload.sourcesContent[sourceContentIndex];
} else {
// If no sourcesContent was found, attempt to load the original source
// from disk:
try {
source = readFileSync(originalSourcePathNoScheme, 'utf8');
} catch (err) {
debug(err);
source = '';
}
}
return source;
}
module.exports = {
prepareStackTrace,
};
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