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73 lines
2.8 KiB
73 lines
2.8 KiB
3 years ago
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import { addInspectMethod } from "./isomorphic.node";
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import { isLazyStack, isWritableStack, joinStacks, lazyJoinStacks } from "./stack";
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import { getDeepKeys, toJSON } from "./to-json";
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const protectedProps = ["name", "message", "stack"];
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/**
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* Extends the new error with the properties of the original error and the `props` object.
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*
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* @param newError - The error object to extend
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* @param originalError - The original error object, if any
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* @param props - Additional properties to add, if any
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*/
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export function extendError(error, originalError, props) {
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let onoError = error;
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extendStack(onoError, originalError);
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// Copy properties from the original error
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if (originalError && typeof originalError === "object") {
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mergeErrors(onoError, originalError);
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}
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// The default `toJSON` method doesn't output props like `name`, `message`, `stack`, etc.
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// So replace it with one that outputs every property of the error.
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onoError.toJSON = toJSON;
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// On Node.js, add support for the `util.inspect()` method
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// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
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if (addInspectMethod) {
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addInspectMethod(onoError);
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}
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// Finally, copy custom properties that were specified by the user.
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// These props OVERWRITE any previous props
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if (props && typeof props === "object") {
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Object.assign(onoError, props);
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}
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return onoError;
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}
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/**
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* Extend the error stack to include its cause
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*/
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function extendStack(newError, originalError) {
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let stackProp = Object.getOwnPropertyDescriptor(newError, "stack");
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if (isLazyStack(stackProp)) {
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lazyJoinStacks(stackProp, newError, originalError);
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}
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else if (isWritableStack(stackProp)) {
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newError.stack = joinStacks(newError, originalError);
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}
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}
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/**
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* Merges properties of the original error with the new error.
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*
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* @param newError - The error object to extend
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* @param originalError - The original error object, if any
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*/
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function mergeErrors(newError, originalError) {
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// Get the original error's keys
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// NOTE: We specifically exclude properties that we have already set on the new error.
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// This is _especially_ important for the `stack` property, because this property has
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// a lazy getter in some environments
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let keys = getDeepKeys(originalError, protectedProps);
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// HACK: We have to cast the errors to `any` so we can use symbol indexers.
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// see https://github.com/Microsoft/TypeScript/issues/1863
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let _newError = newError;
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let _originalError = originalError;
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for (let key of keys) {
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if (_newError[key] === undefined) {
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try {
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_newError[key] = _originalError[key];
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}
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catch (e) {
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// This property is read-only, so it can't be copied
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}
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}
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}
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}
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//# sourceMappingURL=extend-error.js.map
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