Insights: microsoft/TypeScript

17 Pull requests merged by 10 people

• Handle undefined `location.parent` when getting completionEntryDetails

  #54138 merged May 5, 2023

• Add CI job that detects unused baselines

  #54141 merged May 5, 2023

• Ignore self tail calls when collecting the return type of a function

  #53995 merged May 5, 2023

• Remove unnecessary baselines

  #54140 merged May 5, 2023

• Fix TS version appearing in baselines

  #54154 merged May 5, 2023

• Ensure that JSDoc parsing happens within a ParsingContext

  #52710 merged May 4, 2023

• Error on template tag inside callback/overload/typedef tag

  #54118 merged May 4, 2023

• runtests-watch: Don't try to listen for SIGKILL

  #54114 merged May 3, 2023

• Fix crash in getAwaitedType

  #54107 merged May 3, 2023

• Add Node 20 to CI, remove Node 19

  #53897 merged May 2, 2023

• Fix/issue 53286

  #53885 merged May 2, 2023

• JS declaration emit uses `this` for method returns

  #54062 merged May 2, 2023

• Just like request and response, events are also logged as formatted json for readability

  #54105 merged May 2, 2023

• Constraints for generic tuple types

  #53672 merged May 2, 2023

• Type with diverging read/write normalizations still identical to itself

  #54033 merged May 2, 2023

• Add fallback when both co- and contra-variant inference candidates exist

  #54072 merged May 2, 2023

• Ensure call return() for an abrupt completion at for await of loop

  #52754 merged May 1, 2023

18 Pull requests opened by 12 people

• fix(54013): bug: Incorrect Typescript completion with computed property name

  #54067 opened Apr 29, 2023

• fix(54068): Organize Imports removes first deprecated JSDoc comment

  #54071 opened Apr 30, 2023

• Add a failing test case with `types: null` condition

  #54096 opened May 2, 2023

• JSX namespace names should not be considered expressions

  #54104 opened May 2, 2023

• fix(54085): Cannot navigate down object hierarchy if an interface is not directly implemented

  #54108 opened May 2, 2023

• fix issue 53775, do not always narrow to property signature

  #54110 opened May 3, 2023

• Fix `isGenericReducibleType` to allow HKT technique to function again

  #54112 opened May 3, 2023

• Handle module node found error reporting in incremental and watch scneario

  #54115 opened May 3, 2023

• Replace errorType return with Debug fail in checkExpressionWorker

  #54117 opened May 3, 2023

• Include source node inferences in string literal completions

  #54121 opened May 3, 2023

• Add extra Date.UTC signature to reflect ES2017 changes

  #54125 opened May 4, 2023

• Fix(54079): Japanese translation of the TS2637 error message.

  #54128 opened May 4, 2023

• fix(52517): JSDoc Comment Template not provided when unrelated JSDoc with tag exists

  #54132 opened May 4, 2023

• Add extra test cases for string completions

  #54133 opened May 4, 2023

• Transform namespaces declared with module keyword to namespace keyword in d.ts files

  #54134 opened May 4, 2023

• Ensure GHA jobs fail fast in scripts

  #54142 opened May 4, 2023

• Use union types for all common classes of AST nodes

  #54148 opened May 5, 2023

• Update Bug_report.md

  #54153 opened May 5, 2023

39 Issues closed by 20 people

• Inconsistent handling of whitespace in string in template literal types

  #54119 closed May 6, 2023

• No ts 2352 for object literal with missing properties

  #54145 closed May 6, 2023

• Overriding methods has no way to inherit the parameter documentation from the superclass

  #24259 closed May 5, 2023

• Error from completionEntryDetails on entry before definition of merged variable and type alias

  #54106 closed May 5, 2023

• Unsupported wrapper object

  #54059 closed May 5, 2023

• Typescript

  #54156 closed May 5, 2023

• Constructor beside class name (Similar to Java Record, Similar to Kotlin class)

  #54150 closed May 5, 2023

• report unused call results (à la pyright)

  #54149 closed May 5, 2023

• Invalid regular expression during compilation for a known valid regular expression

  #54081 closed May 5, 2023

• Bug: Node18/ES2022 triggers objects to have keys with undefined values: breaks spread

  #54093 closed May 5, 2023

• TypeScript Server Error (4.5.4): Cannot read property 'close' of undefined

  #47423 closed May 4, 2023

• Must reload window after installing npm package to get the package intelligent prompt.

  #54089 closed May 4, 2023

• Function return type obtains different value than type alias definition even though both are explicitly set to same values

  #54136 closed May 4, 2023

• Object.values does not return an undefined type when used on a partial record with explicit string keys set

  #54049 closed May 4, 2023

• Exhaustiveness check fails on types with a literal field

  #54095 closed May 4, 2023

• Debug Failure in invalid JSDoc type expression

  #47537 closed May 4, 2023

• JSDoc @template tag silently terminates @overload tag signature parsing

  #52844 closed May 4, 2023

• `never`-typed properties are required when instantiating object

  #54053 closed May 4, 2023

• Slow performance due to unnecessary updateProgram synchronisation

  #52117 closed May 4, 2023

• runtests-watch runs nothing in modern Node

  #54113 closed May 3, 2023

• `transpileModule` does not account for package.json `type` when ran with node16/nodenext module setting

  #53022 closed May 3, 2023

• Debug assert in getAwaitedTypeNoAlias in test262 repo

  #53145 closed May 3, 2023

• Dynamic imports shouldn't be transpiled in CommonJS

  #54111 closed May 3, 2023

• Property is used before its initialization error is only shown during compilation when using ES2022 but is with ESNext

  #53286 closed May 2, 2023

• Checking falsiness of optionally chained property incorrectly infers definedness of parent

  #54103 closed May 2, 2023

• .d.ts emitted from JS doesn't use `this` for method return types

  #53051 closed May 2, 2023

• Array spread in compiled JS files is incorrect when targeting ES5

  #45251 closed May 2, 2023

• Type '[...T]["length"]' is not assignable to type 'string | number | bigint | boolean | null | undefined'

  #53563 closed May 2, 2023

• Variadic element at position does not match element in target

  #53256 closed May 2, 2023

• Generic Extract alone cannot be used from uninstantiated generic parameter

  #53998 closed May 2, 2023

• Inference regression (5.0.4 vs 4.9.5) with nullable enum function parameter

  #54005 closed May 2, 2023

• Webpage containing license text not reachable

  #54058 closed May 2, 2023

• TS `interface` No prompt `extends`

  #54088 closed May 1, 2023

• for await of loops don't call AsyncIterator.return() on early exit

  #52936 closed May 1, 2023

• [Feature Request] Option to inherit types for .js files from their associated .d.ts file (alternative to JSDoc for IDE type checking)

  #54078 closed May 1, 2023

• imports incorrectly marked as unused when augmenting the module it was imported from in `.d.ts` file

  #54042 closed Apr 30, 2023

• Allow access to non overlapping properties in a union type

  #54069 closed Apr 30, 2023

• ConstructorParameters doesn't work with class alias

  #54007 closed Apr 29, 2023

• Invoke callable types on type level

  #54039 closed Apr 29, 2023

40 Issues opened by 38 people

• Exported decorated class is not defined in decorators API stage3 in CommonJS.

  #54158 opened May 6, 2023

• Allow overloading constructors with type parameters to instantiate the same class but with different generics

  #54157 opened May 5, 2023

• "Move to file" does not carry all function overload and implementation signatures

  #54155 opened May 5, 2023

• Cannot use `const enum` to define an interface key in `isolatedModules` mode

  #54152 opened May 5, 2023

• Calling recursively Generic<infer T>, the T becomes any

  #54151 opened May 5, 2023

• A union is not assignable to property of a union object if the property itself is a union

  #54147 opened May 5, 2023

• Type alias preserving logic defeats complexity reduction mechanisms

  #54146 opened May 5, 2023

• tsc --watch doesn't work in docker container

  #54144 opened May 5, 2023

• Type guard incorrectly erases union type

  #54143 opened May 5, 2023

• TypeScript refactorings should not generate explicit generic type arguments for types that the source interface has omitted due to the existence of defaults

  #54139 opened May 4, 2023

• Support import of jsonc file to infer type

  #54137 opened May 4, 2023

• Missing property incompatible error when there is a namespace with a value export

  #54131 opened May 4, 2023

• Exclude packages from intellisense

  #54135 opened May 4, 2023

• new `Move to file` refactoring should avoid name collisions

  #54130 opened May 4, 2023

• I can't get the interface's props to load properly in the monorepo environment w/o relative path

  #54129 opened May 4, 2023

• Bloomberg feedback for 5.1 beta

  #54127 opened May 4, 2023

• extract function including traling comment that is not selected

  #54126 opened May 4, 2023

• type 'Plugin_2' 'Plugin' is not assignable to type 'PluginOption'.

  #54124 opened May 4, 2023

• Allow disabling ambient types

  #54123 opened May 4, 2023

• Well-typed ECMAScript decorators don't handle generic types in Args

  #54122 opened May 3, 2023

• 'A type predicate's type must be assignable to its parameter's type' should not fire when in a generic predicate function

  #54116 opened May 3, 2023

• Module 'XXX' has no exported member 'xxx'

  #54109 opened May 3, 2023

• `moduleResolution: bundler` diverges from bundlers following node semantics in regards to `default` import

  #54102 opened May 2, 2023

• Google feedback on TS 5.1-beta

  #54101 opened May 2, 2023

• Symbols in `as const` objects should be unique symbols

  #54100 opened May 2, 2023

• Unknown interface "ClassMethodDecoratorFunction" in documentation for 5.0.4 lib.decorators.d.ts

  #54099 opened May 2, 2023

• `isolatedModules` acts like `moduleDetection: "force"`

  #54094 opened May 2, 2023

• Allow files to be excluded from organizeImports

  #54090 opened May 1, 2023

• Can't do a type assertion on an empty array with a branded type.

  #54086 opened May 1, 2023

• Incorrect definition for Date.UTC

  #54084 opened May 1, 2023

• Tail-Recursion Elimination on Conditional Types

  #54082 opened May 1, 2023

• Suggest imports to self-reference a package by its name when it has an `exports` field

  #54080 opened May 1, 2023

• Japanese translation of the TS2637 error message is wrong.

  #54079 opened May 1, 2023

• [ServerErrors][TypeScript] 5.1.0-dev.20230430

  #54077 opened Apr 30, 2023

• Hoist types in declarations or copy JSDoc comments to all copies of type

  #54076 opened Apr 30, 2023

• [ServerErrors][JavaScript] 5.1.0-dev.20230430

  #54075 opened Apr 30, 2023

• [NewErrors] 5.1.0-dev.20230430 vs 5.0.4

  #54074 opened Apr 30, 2023

• Formatter crash on Move To File

  #54073 opened Apr 30, 2023

• infra: hereby watch-min does not watch generate-diagnostics

  #54070 opened Apr 30, 2023

• Organize Imports removes first `@deprecated` JSDoc comment

  #54068 opened Apr 29, 2023

109 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• Evaluate simple template expressions

  #53907 commented on May 6, 2023 • 21 new comments

• Implement partial type argument inference using the _ sigil

  #26349 commented on May 5, 2023 • 18 new comments

• Fixed declaration emit for undefined properties inferred from functions in other array elements

  #53938 commented on May 4, 2023 • 15 new comments

• TypeScript file watcher holds onto folders and causes EPERM

  #54087 commented on May 3, 2023 • 11 new comments

• Inference is broken on intersection type utilizing polymorphic `this`

  #53970 commented on May 4, 2023 • 11 new comments

• Allow skipping some generics when calling a function with multiple generics

  #10571 commented on May 2, 2023 • 9 new comments

• Feature Request: "extends oneof" generic constraint; allows for narrowing type parameters

  #27808 commented on May 6, 2023 • 9 new comments

• Mark more options as affecting errors/resolution

  #53403 commented on May 6, 2023 • 9 new comments

• Support control flow analysis for tagged template calls

  #53962 commented on May 4, 2023 • 9 new comments

• Make AggregateError generic to represent error types

  #54063 commented on May 3, 2023 • 5 new comments

• What’s confusing about modules?

  #51876 commented on May 2, 2023 • 4 new comments

• Regex-validated string types (feedback reset)

  #41160 commented on May 2, 2023 • 4 new comments

• Unexpected behavior in extends clause that has two inferred rest types with constraints

  #50993 commented on May 5, 2023 • 3 new comments

• Skip resolving files directly inside node_modules

  #52809 commented on May 4, 2023 • 3 new comments

• Fixed some string literal argument completions depending on resolved signature

  #53996 commented on May 3, 2023 • 3 new comments

• Allow --watchFactory option that uses user specified plugin for watching files and directories

  #54012 commented on May 5, 2023 • 3 new comments

• [experiment] dedupe intersections/union before construction, preserve intersection ordering

  #54066 commented on May 1, 2023 • 3 new comments

• Import Attributes (Stage 3)

  #53656 commented on May 2, 2023 • 2 new comments

• `Debug Failure. False expression: Paths must either both be absolute or both be relative`

  #54057 commented on May 2, 2023 • 2 new comments

• [TSServer] Very slow semantic diagnostics and completion (7s)

  #53609 commented on May 2, 2023 • 2 new comments

• umd module compiler option doesn't have a fallback for global namespace.

  #8436 commented on May 3, 2023 • 2 new comments

• Check index array length

  #38000 commented on May 3, 2023 • 2 new comments

• Find all references on overridden subclass method includes references to the parent class

  #37878 commented on May 3, 2023 • 2 new comments

• TSC Regression causing crash (Heap OOM) between version 4.8.4 & 4.9.3 in large project

  #53087 commented on May 3, 2023 • 2 new comments

• error TS5071: Option '--resolveJsonModule' can only be specified when module code generation is 'commonjs', 'amd', 'es2015' or 'esNext'

  #30978 commented on May 4, 2023 • 2 new comments

• Type definitions for 'Symbols as WeakMap keys'

  #52534 commented on May 4, 2023 • 2 new comments

• Auto imports imports from 'react-native/types' instead of 'react-native'

  #53577 commented on May 5, 2023 • 2 new comments

• Feature: Self-Type-Checking Types

  #52088 commented on May 4, 2023 • 2 new comments

• fix(53424): in code documentation is not working upon import if function expression reuse function type

  #53964 commented on May 3, 2023 • 2 new comments

• Perform partial inference with partially filled type parameter lists

  #54047 commented on May 3, 2023 • 2 new comments

• Spread operator should not have worse ergonomics than `apply` - unexpected error spreading a union-of-tuples

  #49802 commented on Apr 29, 2023 • 1 new comment

• Allow type annotation on catch clause variable

  #20024 commented on Apr 29, 2023 • 1 new comment

• Regression: class implementing `File` errors with "missing property 'prototype'"

  #52166 commented on Apr 29, 2023 • 1 new comment

• Allow for optional index signatures (for the sake of `exactOptionalPropertyTypes`)

  #46969 commented on Apr 29, 2023 • 1 new comment

• Unable to use Symbol as key for jsdoc `@typedef`

  #47259 commented on Apr 30, 2023 • 1 new comment

• 'used before being assigned' error inside a type alias

  #46425 commented on Apr 30, 2023 • 1 new comment

• Array.isArray type narrows to any[] for ReadonlyArray<T>

  #17002 commented on Apr 30, 2023 • 1 new comment

• 4.8.2: Type serialization error with unique symbol

  #50720 commented on Apr 30, 2023 • 1 new comment

• “Type instantiation is excessively deep and possibly infinite” but only in a large codebase

  #34933 commented on Apr 30, 2023 • 1 new comment

• Provide .ts developer experience for .js modules (with a .d.ts without JSDoc)

  #30304 commented on May 1, 2023 • 1 new comment

• JSDoc comment for destructuring param: description text not displayed

  #24746 commented on May 1, 2023 • 1 new comment

• Feature Request: Macros

  #4892 commented on May 1, 2023 • 1 new comment

• Parameters<typeof someFunction> does not preserve type constraint or parameter inference.

  #54014 commented on May 1, 2023 • 1 new comment

• Typescript can't infer types when using Proxy

  #20846 commented on May 1, 2023 • 1 new comment

• Cannot navigate down object hierarchy if an interface is not directly implemented

  #54085 commented on May 1, 2023 • 1 new comment

• package.json `exports` resolution uses fallback conditions, unlike Node

  #50762 commented on May 1, 2023 • 1 new comment

• Support closed-file diagnostics in VS Code

  #36664 commented on May 1, 2023 • 1 new comment

• Ability to extend compilerOptions's paths config

  #44589 commented on May 2, 2023 • 1 new comment

• Feature request: allow user to merge extended arrays in tsconfig files

  #20110 commented on May 2, 2023 • 1 new comment

• Support parsing TSDoc string comments

  #38106 commented on May 2, 2023 • 1 new comment

• Proposal: Interval Types / Inequality Types

  #43505 commented on May 2, 2023 • 1 new comment

• Completion for string property doesn't include replacementSpan if string is unclosed

  #54092 commented on May 2, 2023 • 1 new comment

• Stricter disjunction of interfaces

  #54051 commented on May 2, 2023 • 1 new comment

• type destructuring

  #35396 commented on May 3, 2023 • 1 new comment

• Force Override Declarations Types

  #36146 commented on May 3, 2023 • 1 new comment

• Generator Functions are not assignable to type GeneratorFunction

  #45146 commented on May 3, 2023 • 1 new comment

• Validated completions available for string props are not available for shallow strings

  #53997 commented on May 4, 2023 • 1 new comment

• Type narrowing with foo.constructor

  #16035 commented on May 5, 2023 • 1 new comment

• Allow use of `infer` in the type parameter of a type declaration

  #52791 commented on May 5, 2023 • 1 new comment

• `{@link https...}` inside a `@remarks` causes error TS2304: Cannot find name 'https'

  #49109 commented on May 5, 2023 • 1 new comment

• Allow static members in abstract classes to reference type parameters

  #34665 commented on May 5, 2023 • 1 new comment

• Null checks should allow narrowing of union types under strict null checks

  #49467 commented on May 5, 2023 • 1 new comment

• Fails type check for type unions as keys to the Map constructor

  #39133 commented on May 6, 2023 • 1 new comment

• Use the width of a type to add newlines in type assignment error messages

  #45896 commented on May 6, 2023 • 1 new comment

• [Suggestion] Allow @ts-ignore at the end of the same line

  #20111 commented on May 6, 2023 • 1 new comment

• Proposal: Conditional Compilation

  #3538 commented on May 6, 2023 • 1 new comment

• Add `NoInfer` intrinsic type

  #52968 commented on May 1, 2023 • 1 new comment

• Cover more cases for node module auto-import

  #54024 commented on May 5, 2023 • 1 new comment

• Experiment: with esModuleInterop, synthesize a default even when the module is not a function

  #54065 commented on May 1, 2023 • 1 new comment

• Add type operators that can answer "given function type T, what is the type of its return value when arguments P are passed in?"

  #40179 commented on Apr 30, 2023 • 0 new comments

• Accessors are always reduced to properties in object literal declarations

  #53775 commented on May 1, 2023 • 0 new comments

• Import uses old filename casing

  #54091 commented on May 1, 2023 • 0 new comments

• Spreading tuple into generic/type arguments

  #39648 commented on May 2, 2023 • 0 new comments

• JSDoc type aliases aren't parsed or bound at the end of blocks

  #54043 commented on May 2, 2023 • 0 new comments

• extends operator with literal types

  #54050 commented on May 2, 2023 • 0 new comments

• Error in 'visitEachChildOfIndexSignatureDeclaration' during 'quickinfo'

  #53864 commented on May 2, 2023 • 0 new comments

• normalizeSlashes should probably no-op on *nix

  #44174 commented on May 4, 2023 • 0 new comments

• Parameters created from tuple are treated as mutable instead of immutable, unless written as "...args"

  #53255 commented on May 4, 2023 • 0 new comments

• JSDoc unexpected leading whitespace behaviour with `@example` and `<caption>`

  #43955 commented on May 5, 2023 • 0 new comments

• JSDoc support for object literal fields

  #290 commented on May 6, 2023 • 0 new comments

• disallow comparing to null and undefined unless they are valid cases in strict null mode

  #11920 commented on May 6, 2023 • 0 new comments

• Support Intellisense for string/number literals in a widened union

  #33471 commented on May 6, 2023 • 0 new comments

• improper declared type cause narrow type not work when its computed type is not union.

  #39114 commented on May 6, 2023 • 0 new comments

• In JSDoc @type is not a type declaration, which it is much more like type conversion.

  #39650 commented on May 6, 2023 • 0 new comments

• Class Property Inference from Constructors fails for a simple object declared in place

  #39681 commented on May 6, 2023 • 0 new comments

• Hoisted function declarations should be assigned to `exports` before any `require` calls

  #39853 commented on May 6, 2023 • 0 new comments

• Unexpected behavior (possible bug)

  #39970 commented on May 6, 2023 • 0 new comments

• Support “Arbitrary module namespace identifier names”

  #40594 commented on May 6, 2023 • 0 new comments

• Using an optional call with `.flat()` produces incorrect types

  #41007 commented on May 6, 2023 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on May 6, 2023 • 0 new comments

• Error when trying to assign a subclass of a base class with generics to `typeof` of that base class

  #41770 commented on May 6, 2023 • 0 new comments

• Correctly handle generic functions (e.g.: `Object.freeze`) passed as callbacks to generic functions (e.g.: `Array.prototype.map`)

  #42862 commented on May 6, 2023 • 0 new comments

• Support inferring `never` as the return type in JavaScript when overriding a class method that returns `never`

  #46791 commented on May 6, 2023 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on May 6, 2023 • 0 new comments

• [NewErrors] 4.8.0-dev.20220609 vs 4.7.3

  #49460 commented on May 6, 2023 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on May 6, 2023 • 0 new comments

• Types declared in types.d.ts not included in output of tsc --emitDeclarationOnly

  #51784 commented on May 6, 2023 • 0 new comments

• Expression produces a union type that is too complex to represent

  #53234 commented on May 6, 2023 • 0 new comments

• Normative: Arbitrary module namespace identifier names

  #49297 commented on Apr 30, 2023 • 0 new comments

• [Experiment] Convert parser namespace into a module

  #51470 commented on May 1, 2023 • 0 new comments

• [experiment] direct imports

  #51590 commented on May 1, 2023 • 0 new comments

• Attempt to reduce types which are about to produce a complexity error

  #53739 commented on May 2, 2023 • 0 new comments

• Cache last computed flow type for identifiers and 'this'

  #53893 commented on May 2, 2023 • 0 new comments

• Treat `TemplateExpression` as possibly discriminant values

  #53903 commented on May 2, 2023 • 0 new comments

• fix(53919): Cannot read properties of undefined (reading 'flags') in returnValueCorrect

  #53921 commented on May 2, 2023 • 0 new comments

• Add extra tests for contextual typing of unannotated parameters with default initializers

  #53940 commented on May 2, 2023 • 0 new comments

• fix(53933): Confusing rules around function parameter names in a type

  #53946 commented on May 2, 2023 • 0 new comments

• Fix double error on invalid delete of readonly property

  #53961 commented on May 3, 2023 • 0 new comments

• Revert octokit pinning now that the package is fixed

  #53966 commented on May 3, 2023 • 0 new comments