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BugA bug in TypeScriptA bug in TypeScriptFix AvailableA PR has been opened for this issueA PR has been opened for this issue
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TypeScript Version: 4.0.0-dev.20200803
Search Terms: class property inference, private class fields
Expected behavior: private class field's type is inferred from its assignment in the constructor
Actual behavior: typechecker reports implicit any for private class field
Related Issues:
Code
class Example {
#test;
constructor(test: number) {
this.#test = test;
}
get test() {
return this.#test
}
}Output
"use strict";
var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, privateMap, value) {
if (!privateMap.has(receiver)) {
throw new TypeError("attempted to set private field on non-instance");
}
privateMap.set(receiver, value);
return value;
};
var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, privateMap) {
if (!privateMap.has(receiver)) {
throw new TypeError("attempted to get private field on non-instance");
}
return privateMap.get(receiver);
};
var _test;
class Example {
constructor(test) {
_test.set(this, void 0);
__classPrivateFieldSet(this, _test, test);
}
get test() {
return __classPrivateFieldGet(this, _test);
}
}
_test = new WeakMap();Compiler Options
{
"compilerOptions": {
"noImplicitAny": true,
"strictNullChecks": true,
"strictFunctionTypes": true,
"strictPropertyInitialization": true,
"strictBindCallApply": true,
"noImplicitThis": true,
"noImplicitReturns": true,
"alwaysStrict": true,
"esModuleInterop": true,
"declaration": true,
"experimentalDecorators": true,
"emitDecoratorMetadata": true,
"moduleResolution": 2,
"target": "ES2017",
"jsx": "React",
"module": "ESNext"
}
}Playground Link: Provided
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BugA bug in TypeScriptA bug in TypeScriptFix AvailableA PR has been opened for this issueA PR has been opened for this issue