116 lines
3.2 KiB
JavaScript
116 lines
3.2 KiB
JavaScript
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow strict
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* @polyfill
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*/
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let _inGuard = 0;
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type ErrorHandler = (error: mixed, isFatal: boolean) => void;
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type Fn<Args, Return> = (...Args) => Return;
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/**
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* This is the error handler that is called when we encounter an exception
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* when loading a module. This will report any errors encountered before
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* ExceptionsManager is configured.
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*/
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let _globalHandler: ErrorHandler = function onError(
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e: mixed,
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isFatal: boolean,
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) {
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throw e;
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};
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/**
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* The particular require runtime that we are using looks for a global
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* `ErrorUtils` object and if it exists, then it requires modules with the
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* error handler specified via ErrorUtils.setGlobalHandler by calling the
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* require function with applyWithGuard. Since the require module is loaded
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* before any of the modules, this ErrorUtils must be defined (and the handler
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* set) globally before requiring anything.
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*/
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const ErrorUtils = {
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setGlobalHandler(fun: ErrorHandler): void {
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_globalHandler = fun;
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},
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getGlobalHandler(): ErrorHandler {
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return _globalHandler;
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},
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reportError(error: mixed): void {
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_globalHandler && _globalHandler(error, false);
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},
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reportFatalError(error: mixed): void {
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// NOTE: This has an untyped call site in Metro.
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_globalHandler && _globalHandler(error, true);
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},
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applyWithGuard<TArgs: $ReadOnlyArray<mixed>, TOut>(
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fun: Fn<TArgs, TOut>,
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context?: ?mixed,
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args?: ?TArgs,
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// Unused, but some code synced from www sets it to null.
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unused_onError?: null,
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// Some callers pass a name here, which we ignore.
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unused_name?: ?string,
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): ?TOut {
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try {
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_inGuard++;
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// $FlowFixMe: TODO T48204745 (1) apply(context, null) is fine. (2) array -> rest array should work
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return fun.apply(context, args);
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} catch (e) {
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ErrorUtils.reportError(e);
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} finally {
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_inGuard--;
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}
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return null;
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},
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applyWithGuardIfNeeded<TArgs: $ReadOnlyArray<mixed>, TOut>(
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fun: Fn<TArgs, TOut>,
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context?: ?mixed,
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args?: ?TArgs,
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): ?TOut {
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if (ErrorUtils.inGuard()) {
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// $FlowFixMe: TODO T48204745 (1) apply(context, null) is fine. (2) array -> rest array should work
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return fun.apply(context, args);
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} else {
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ErrorUtils.applyWithGuard(fun, context, args);
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}
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return null;
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},
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inGuard(): boolean {
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return !!_inGuard;
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},
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guard<TArgs: $ReadOnlyArray<mixed>, TOut>(
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fun: Fn<TArgs, TOut>,
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name?: ?string,
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context?: ?mixed,
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): ?(...TArgs) => ?TOut {
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// TODO: (moti) T48204753 Make sure this warning is never hit and remove it - types
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// should be sufficient.
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if (typeof fun !== 'function') {
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console.warn('A function must be passed to ErrorUtils.guard, got ', fun);
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return null;
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}
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const guardName = name ?? fun.name ?? '<generated guard>';
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function guarded(...args: TArgs): ?TOut {
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return ErrorUtils.applyWithGuard(
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fun,
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context ?? this,
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args,
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null,
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guardName,
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);
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}
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return guarded;
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},
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};
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global.ErrorUtils = ErrorUtils;
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export type ErrorUtilsT = typeof ErrorUtils;
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