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core.ts
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core.ts
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Error.stackTraceLimit = Math.max( 100, Error.stackTraceLimit || 0 );
const reStackEntry = /\s+at\s/;
function splitErrorStack( error?: Error )
{
if ( !error )
return { message: "Unknown error", lines: [ ] };
if ( !error.stack )
return { message: error.message, lines: [ ] };
const lines = error.stack.split( "\n" );
const index = lines.findIndex( line => reStackEntry.test( line ) );
const message = lines.slice( 0, index ).join( "\n" );
return { message, lines: lines.slice( index ) };
}
function mergeErrors( traceError: Error, mainError?: Error )
{
const { lines: traceLines } = splitErrorStack( traceError );
const { lines: errorLines, message } = splitErrorStack( mainError )
if ( traceLines[ 0 ].includes( "at new TraceablePromise" ) )
{
traceLines.shift( );
const ignore = [
"at Function.reject (<anonymous>)",
"at Promise.__proto__.constructor.reject",
];
if ( ignore.some( test => traceLines[ 0 ].includes( test ) ) )
traceLines.shift( );
}
traceLines.reverse( );
errorLines.reverse( );
var i = 0;
for ( ;
i < errorLines.length &&
i < traceLines.length &&
errorLines[ i ] === traceLines[ i ];
++i
);
return message +
"\n ==== Promise at: ==================\n" +
traceLines.slice( i ).reverse( ).join( "\n" ) +
"\n\n ==== Error at: ====================\n" +
errorLines.slice( i ).reverse( ).join( "\n" ) +
"\n\n ==== Shared trace: ================\n" +
errorLines.slice( 0, i ).reverse( ).join( "\n" );
}
function defaultLogger( msg: string )
{
console.error( msg );
}
export type LoggerFunction = ( msg: string ) => void;
let loggerFunction: LoggerFunction = defaultLogger;
export function setLogger( loggerFn: LoggerFunction )
{
loggerFunction = loggerFn ?? defaultLogger;
}
export function logger(
reason: Error | undefined,
promise: TraceablePromise< any >,
pid: number | undefined = void 0
)
{
const stack =
promise.__tracedError
? mergeErrors( promise.__tracedError, reason )
: reason
? reason.stack
: "Unknown stack";
const prefix = pid == null ? '' : `(node:${pid}) `;
loggerFunction(
`${prefix}UnhandledPromiseRejectionWarning\n` +
(
!promise.__tracedError
? ""
: `[ Stacktrace altered by ` +
`https://github.com/grantila/trace-unhandled ]\n`
) +
stack
);
}
const state: { resolve: any; reject: any; } = { resolve: null, reject: null };
export type PromiseResolver< T > = ( value: T | PromiseLike< T > ) => void;
export type PromiseRejecter = ( reason?: any ) => void;
export type PromiseConstructor< T > =
( resolve: PromiseResolver< T >, reject: PromiseRejecter ) => void;
export class TraceablePromise< T > extends Promise< T >
{
public __tracedError?: Error;
public constructor( executor: PromiseConstructor< T > )
{
super( wrappedExecutor );
function wrappedExecutor(
resolve: PromiseResolver< T >,
reject: PromiseRejecter
)
{
state.resolve = resolve;
state.reject = reject;
}
const resolve = state.resolve;
const reject = state.reject;
state.resolve = null;
state.reject = null;
const err = new Error( "Non-failing tracing error" );
this.__tracedError = err;
try
{
executor( resolve, reject );
}
catch ( err )
{
reject( err );
}
}
}