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Joe Savona
05d1fe94f9
Moves _some_ files from HIR into new top-level directories. To not make @gsathya's life a pain I left the files he's touching alone, but I moved some others. My intent is to have something like this: * Babel/ - code for the Babel plugin, though ideally this actually gets split into a separate package and the compiler itself is AST in, AST out w no Babel dep. * HIR/ - the core HIRFunction, HIR and related data types, plus the HIR construction and printing, HIR visitors. * Inference/ - the core inference passes that operate on the HIR, including type inference, reference effects, alias analysis, mutable range analysis, etc. I'll let @gsathya move these files when at a good stopping point. * ReactiveScopes/ - inference relating to reactive scopes, constructing/printing/codegenning ReactiveFunction * SSA/ - enter/leave SSA and eliminate redundant phis * Utils/ - every project needs a place to put stuff that doesn't fit into the other categories, this is ours. This leaves just index.ts at the top level, and overall feels pretty tidy. Not too tedious to figure out where anything goes, hopefully.
47 lines
1.0 KiB
TypeScript
47 lines
1.0 KiB
TypeScript
/**
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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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/**
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* Trigger an exhaustivess check in TypeScript and throw at runtime.
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*
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* Example:
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*
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* ```ts
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* enum ErrorCode = {
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* E0001 = "E0001",
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* E0002 = "E0002"
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* }
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*
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* switch (code) {
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* case ErrorCode.E0001:
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* // ...
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* default:
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* assertExhaustive(code, "Unhandled error code");
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* }
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* ```
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*/
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export function assertExhaustive(_: never, errorMsg: string): never {
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throw new Error(errorMsg);
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}
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/**
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* Modifies @param array in place, retaining only the items where the predicate returns true.
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*/
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export function retainWhere<T>(
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array: Array<T>,
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predicate: (item: T) => boolean
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) {
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let writeIndex = 0;
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for (let readIndex = 0; readIndex < array.length; readIndex++) {
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const item = array[readIndex];
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if (predicate(item) === true) {
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array[writeIndex++] = item;
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}
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}
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array.length = writeIndex;
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}
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