Template literal types for template literal expressions #41891
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typescript-bot
added
Author: Team
For Uncommitted Bug
ahejlsberg
requested review from
DanielRosenwasser,
RyanCavanaugh and
weswigham
This was referenced Dec 9, 2020
DanielRosenwasser
requested changes
Dec 9, 2020
tests/baselines/reference/emitExponentiationOperatorInTempalteString4.types
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@typescript-bot test this |
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Heya @ahejlsberg, I've started to run the parallelized Definitely Typed test suite on this PR at 96885c3. You can monitor the build here. |
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Heya @ahejlsberg, I've started to run the perf test suite on this PR at 96885c3. You can monitor the build here. Update: The results are in! |
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Heya @ahejlsberg, I've started to run the extended test suite on this PR at 96885c3. You can monitor the build here. |
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Heya @ahejlsberg, I've started to run the parallelized community code test suite on this PR at 96885c3. You can monitor the build here. |
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The user suite test run you requested has finished and failed. I've opened a PR with the baseline diff from master. |
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@ahejlsberg Here they are:Comparison Report - master..41891
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Test suites revealed that template literal types didn't consistently have a |
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@typescript-bot test this |
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Heya @ahejlsberg, I've started to run the parallelized community code test suite on this PR at 5cf670b. You can monitor the build here. |
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Heya @ahejlsberg, I've started to run the extended test suite on this PR at 5cf670b. You can monitor the build here. |
weswigham
approved these changes
Dec 9, 2020
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DT run is clean. Performance looks fine. Latest RWC run shows a few errors that shouldn't have been errors disappearing. |
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Three user test suites have new errors. office-ui-fabricWe are now (correctly) reporting an error that was previously silenced because they're compiling with declare const someStringArray: string[];
someStringArray.map(key => !!true ? `foo${key}` : null).filter((s: string) => s);We now report an error neither We're also reporting an error on something similar to this: declare const someStringArray: string[];
someStringArray.map(key => `foo${key}`).concat(someStringArray); // string[] not assignable to `foo${string}`[]Ideally this wouldn't be an error. The core issue is that fp-tsOne new error that looks to be correct and simply a result of the stronger typing. webpackOne new error on something similar to this: declare const someArray: unknown[];
someArray.map(item => `foo${item}`).unshift("someString"); // Type "someString" not assignable to type `foo${string}`Not much we can do about this. The array is now of type |
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I'm going to mark this as a breaking change given what we're seeing in the user test suites. |
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Oof, apparently breaky enough to break our own build post-LKG. Namely, we have const internal = jsDocStyle ? `/**@internal*/` : `/*@internal*/`;
// ...
appendText(fs, sources[Project.second][Source.ts][Part.one], `
class normalC {
${internal} constructor() { }
${internal} prop: string;
${internal} method() { }
${internal} get c() { return 10; }
${internal} set c(val: number) { }
}
namespace normalN {
${internal} export class C { }
${internal} export function foo() {}
${internal} export namespace someNamespace { export class C {} }
${internal} export namespace someOther.something { export class someClass {} }
${internal} export import someImport = someNamespace.C;
${internal} export type internalType = internalC;
${internal} export const internalConst = 10;
${internal} export enum internalEnum { a, b, c }
}
${internal} class internalC {}
${internal} function internalfoo() {}
${internal} namespace internalNamespace { export class someClass {} }
${internal} namespace internalOther.something { export class someClass {} }
${internal} import internalImport = internalNamespace.someClass;
${internal} type internalType = internalC;
${internal} const internalConst = 10;
${internal} enum internalEnum { a, b, c }`);in our test harness. |
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#41942 is up with a fix to the build break, assuming we don't want to do anything with this change, |
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Hey @DanielRosenwasser, considering that changes here were rolled back, do we have a new issue opened for this? Or you'll reopen this one #41631? |
This was referenced Mar 24, 2021
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With this PR we infer template literal types for template literal expressions. The PR adheres to the same principles as those of literal types in #10676 and widening vs. non-widening literal types in #11126. For example:
As it is generally a breaking change for us to more strongly type anything, I'm marking this as a breaking change. In practice, the breaks appear to be rare and easy to fix.
Fixes #41631.