Narrow destructured variables based on initializer's analysis result
This PR introduces a method to narrow the types of destructured variables through control flow analysis without relying on the discriminant member. When the initializer of the `ObjectBindingPattern` is available, we attempt to narrow its type, which in turn helps further refine the type of the destructured variable. Partially fixes #59657
This commit is contained in:
Yi Sun
Родитель
a86b5e2b01
Коммит
77cb42b3d5
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@ -30286,7 +30286,10 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
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links.flags &= ~NodeCheckFlags.InCheckIdentifier;
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if (parentTypeConstraint && parentTypeConstraint.flags & TypeFlags.Union && !(rootDeclaration.kind === SyntaxKind.Parameter && isSomeSymbolAssigned(rootDeclaration))) {
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const pattern = declaration.parent;
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const narrowedType = getFlowTypeOfReference(pattern, parentTypeConstraint, parentTypeConstraint, /*flowContainer*/ undefined, location.flowNode);
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const initialType = parent.initializer
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? getFlowTypeOfReference(parent.initializer, parentTypeConstraint, parentTypeConstraint, /*flowContainer*/ undefined, location.flowNode)
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: parentTypeConstraint;
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const narrowedType = getFlowTypeOfReference(pattern, parentTypeConstraint, initialType, /*flowContainer*/ undefined, location.flowNode);
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if (narrowedType.flags & TypeFlags.Never) {
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return neverType;
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}
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@ -0,0 +1,72 @@
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//// [tests/cases/compiler/narrowDestructuredVariables.ts] ////
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//// [narrowDestructuredVariables.ts]
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interface Ref<T> { current: T };
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type ToRefs<T> = { [K in keyof T]: Ref<T[K]> };
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declare function toRefs<T>(o: T): ToRefs<T>;
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interface DataPrepared {
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prepared: true
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payload: string
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};
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interface DataPending {
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prepared: false
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payload: null
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};
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type Data = DataPrepared | DataPending;
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declare function isDataRefsPrepared(refs: ToRefs<Data>): refs is ToRefs<DataPrepared>;
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declare const data: Data;
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const dataRefs = toRefs(data);
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const { prepared, payload } = dataRefs;
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if (prepared.current) {
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prepared.current;
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payload.current;
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data.prepared;
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data.payload;
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}
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if (isDataRefsPrepared(dataRefs)) {
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prepared.current;
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payload.current;
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data.prepared;
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data.payload;
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}
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if (data.prepared) {
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prepared.current;
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payload.current;
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data.prepared;
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data.payload;
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}
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//// [narrowDestructuredVariables.js]
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"use strict";
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;
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;
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;
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const dataRefs = toRefs(data);
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const { prepared, payload } = dataRefs;
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if (prepared.current) {
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prepared.current;
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payload.current;
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data.prepared;
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data.payload;
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}
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if (isDataRefsPrepared(dataRefs)) {
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prepared.current;
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payload.current;
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data.prepared;
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data.payload;
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}
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if (data.prepared) {
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prepared.current;
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payload.current;
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data.prepared;
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data.payload;
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}
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@ -0,0 +1,153 @@
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//// [tests/cases/compiler/narrowDestructuredVariables.ts] ////
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=== narrowDestructuredVariables.ts ===
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interface Ref<T> { current: T };
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>Ref : Symbol(Ref, Decl(narrowDestructuredVariables.ts, 0, 0))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 0, 14))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 0, 14))
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type ToRefs<T> = { [K in keyof T]: Ref<T[K]> };
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>ToRefs : Symbol(ToRefs, Decl(narrowDestructuredVariables.ts, 0, 32))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 1, 12))
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>K : Symbol(K, Decl(narrowDestructuredVariables.ts, 1, 20))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 1, 12))
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>Ref : Symbol(Ref, Decl(narrowDestructuredVariables.ts, 0, 0))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 1, 12))
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>K : Symbol(K, Decl(narrowDestructuredVariables.ts, 1, 20))
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declare function toRefs<T>(o: T): ToRefs<T>;
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>toRefs : Symbol(toRefs, Decl(narrowDestructuredVariables.ts, 1, 47))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 2, 24))
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>o : Symbol(o, Decl(narrowDestructuredVariables.ts, 2, 27))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 2, 24))
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>ToRefs : Symbol(ToRefs, Decl(narrowDestructuredVariables.ts, 0, 32))
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>T : Symbol(T, Decl(narrowDestructuredVariables.ts, 2, 24))
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interface DataPrepared {
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>DataPrepared : Symbol(DataPrepared, Decl(narrowDestructuredVariables.ts, 2, 44))
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prepared: true
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>prepared : Symbol(DataPrepared.prepared, Decl(narrowDestructuredVariables.ts, 4, 24))
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payload: string
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>payload : Symbol(DataPrepared.payload, Decl(narrowDestructuredVariables.ts, 5, 18))
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};
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interface DataPending {
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>DataPending : Symbol(DataPending, Decl(narrowDestructuredVariables.ts, 7, 2))
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prepared: false
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>prepared : Symbol(DataPending.prepared, Decl(narrowDestructuredVariables.ts, 9, 23))
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payload: null
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>payload : Symbol(DataPending.payload, Decl(narrowDestructuredVariables.ts, 10, 19))
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};
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type Data = DataPrepared | DataPending;
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>Data : Symbol(Data, Decl(narrowDestructuredVariables.ts, 12, 2))
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>DataPrepared : Symbol(DataPrepared, Decl(narrowDestructuredVariables.ts, 2, 44))
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>DataPending : Symbol(DataPending, Decl(narrowDestructuredVariables.ts, 7, 2))
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declare function isDataRefsPrepared(refs: ToRefs<Data>): refs is ToRefs<DataPrepared>;
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>isDataRefsPrepared : Symbol(isDataRefsPrepared, Decl(narrowDestructuredVariables.ts, 14, 39))
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>refs : Symbol(refs, Decl(narrowDestructuredVariables.ts, 16, 36))
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>ToRefs : Symbol(ToRefs, Decl(narrowDestructuredVariables.ts, 0, 32))
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>Data : Symbol(Data, Decl(narrowDestructuredVariables.ts, 12, 2))
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>refs : Symbol(refs, Decl(narrowDestructuredVariables.ts, 16, 36))
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>ToRefs : Symbol(ToRefs, Decl(narrowDestructuredVariables.ts, 0, 32))
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>DataPrepared : Symbol(DataPrepared, Decl(narrowDestructuredVariables.ts, 2, 44))
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declare const data: Data;
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>Data : Symbol(Data, Decl(narrowDestructuredVariables.ts, 12, 2))
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const dataRefs = toRefs(data);
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>dataRefs : Symbol(dataRefs, Decl(narrowDestructuredVariables.ts, 19, 5))
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>toRefs : Symbol(toRefs, Decl(narrowDestructuredVariables.ts, 1, 47))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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const { prepared, payload } = dataRefs;
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 20, 7))
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>payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 20, 17))
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>dataRefs : Symbol(dataRefs, Decl(narrowDestructuredVariables.ts, 19, 5))
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if (prepared.current) {
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>prepared.current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 20, 7))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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prepared.current;
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>prepared.current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18))
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 20, 7))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18))
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payload.current;
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>payload.current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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>payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 20, 17))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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data.prepared;
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>data.prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 4, 24), Decl(narrowDestructuredVariables.ts, 9, 23))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 4, 24), Decl(narrowDestructuredVariables.ts, 9, 23))
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data.payload;
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>data.payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 5, 18), Decl(narrowDestructuredVariables.ts, 10, 19))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 5, 18), Decl(narrowDestructuredVariables.ts, 10, 19))
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}
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if (isDataRefsPrepared(dataRefs)) {
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>isDataRefsPrepared : Symbol(isDataRefsPrepared, Decl(narrowDestructuredVariables.ts, 14, 39))
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>dataRefs : Symbol(dataRefs, Decl(narrowDestructuredVariables.ts, 19, 5))
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prepared.current;
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>prepared.current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18))
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 20, 7))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18))
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payload.current;
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>payload.current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18))
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>payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 20, 17))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18))
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data.prepared;
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>data.prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 4, 24), Decl(narrowDestructuredVariables.ts, 9, 23))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 4, 24), Decl(narrowDestructuredVariables.ts, 9, 23))
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data.payload;
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>data.payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 5, 18), Decl(narrowDestructuredVariables.ts, 10, 19))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 5, 18), Decl(narrowDestructuredVariables.ts, 10, 19))
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}
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if (data.prepared) {
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>data.prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 4, 24), Decl(narrowDestructuredVariables.ts, 9, 23))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 4, 24), Decl(narrowDestructuredVariables.ts, 9, 23))
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prepared.current;
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>prepared.current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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>prepared : Symbol(prepared, Decl(narrowDestructuredVariables.ts, 20, 7))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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payload.current;
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>payload.current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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>payload : Symbol(payload, Decl(narrowDestructuredVariables.ts, 20, 17))
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>current : Symbol(Ref.current, Decl(narrowDestructuredVariables.ts, 0, 18), Decl(narrowDestructuredVariables.ts, 0, 18))
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data.prepared;
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>data.prepared : Symbol(DataPrepared.prepared, Decl(narrowDestructuredVariables.ts, 4, 24))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>prepared : Symbol(DataPrepared.prepared, Decl(narrowDestructuredVariables.ts, 4, 24))
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data.payload;
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>data.payload : Symbol(DataPrepared.payload, Decl(narrowDestructuredVariables.ts, 5, 18))
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>data : Symbol(data, Decl(narrowDestructuredVariables.ts, 18, 13))
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>payload : Symbol(DataPrepared.payload, Decl(narrowDestructuredVariables.ts, 5, 18))
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}
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@ -0,0 +1,198 @@
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//// [tests/cases/compiler/narrowDestructuredVariables.ts] ////
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=== narrowDestructuredVariables.ts ===
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interface Ref<T> { current: T };
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>current : T
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> : ^
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type ToRefs<T> = { [K in keyof T]: Ref<T[K]> };
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>ToRefs : ToRefs<T>
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> : ^^^^^^^^^
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declare function toRefs<T>(o: T): ToRefs<T>;
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>toRefs : <T>(o: T) => ToRefs<T>
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> : ^ ^^ ^^ ^^^^^
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>o : T
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> : ^
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interface DataPrepared {
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prepared: true
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>prepared : true
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> : ^^^^
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>true : true
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> : ^^^^
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payload: string
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>payload : string
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> : ^^^^^^
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};
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interface DataPending {
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prepared: false
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>prepared : false
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> : ^^^^^
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>false : false
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> : ^^^^^
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payload: null
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>payload : null
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> : ^^^^
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};
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type Data = DataPrepared | DataPending;
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>Data : Data
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> : ^^^^
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declare function isDataRefsPrepared(refs: ToRefs<Data>): refs is ToRefs<DataPrepared>;
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>isDataRefsPrepared : (refs: ToRefs<Data>) => refs is ToRefs<DataPrepared>
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> : ^ ^^ ^^^^^
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>refs : ToRefs<Data>
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> : ^^^^^^^^^^^^
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declare const data: Data;
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>data : Data
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> : ^^^^
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const dataRefs = toRefs(data);
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>dataRefs : ToRefs<Data>
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> : ^^^^^^^^^^^^
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>toRefs(data) : ToRefs<Data>
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> : ^^^^^^^^^^^^
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>toRefs : <T>(o: T) => ToRefs<T>
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> : ^ ^^ ^^ ^^^^^
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>data : Data
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> : ^^^^
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const { prepared, payload } = dataRefs;
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>prepared : Ref<true> | Ref<false>
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> : ^^^^^^^^^^^^^^^^^^^^^^
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>payload : Ref<string> | Ref<null>
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> : ^^^^^^^^^^^^^^^^^^^^^^^
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>dataRefs : ToRefs<Data>
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> : ^^^^^^^^^^^^
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if (prepared.current) {
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>prepared.current : boolean
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> : ^^^^^^^
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>prepared : Ref<true> | Ref<false>
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> : ^^^^^^^^^^^^^^^^^^^^^^
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>current : boolean
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> : ^^^^^^^
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prepared.current;
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>prepared.current : true
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> : ^^^^
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>prepared : Ref<true>
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> : ^^^^^^^^^
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>current : true
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> : ^^^^
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payload.current;
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>payload.current : string | null
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> : ^^^^^^^^^^^^^
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>payload : Ref<string> | Ref<null>
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> : ^^^^^^^^^^^^^^^^^^^^^^^
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>current : string | null
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> : ^^^^^^^^^^^^^
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data.prepared;
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>data.prepared : boolean
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> : ^^^^^^^
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>data : Data
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> : ^^^^
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>prepared : boolean
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> : ^^^^^^^
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data.payload;
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>data.payload : string | null
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> : ^^^^^^^^^^^^^
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>data : Data
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> : ^^^^
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>payload : string | null
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> : ^^^^^^^^^^^^^
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}
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if (isDataRefsPrepared(dataRefs)) {
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>isDataRefsPrepared(dataRefs) : boolean
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> : ^^^^^^^
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>isDataRefsPrepared : (refs: ToRefs<Data>) => refs is ToRefs<DataPrepared>
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> : ^ ^^ ^^^^^
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>dataRefs : ToRefs<Data>
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> : ^^^^^^^^^^^^
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prepared.current;
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>prepared.current : true
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> : ^^^^
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>prepared : Ref<true>
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> : ^^^^^^^^^
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>current : true
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> : ^^^^
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payload.current;
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>payload.current : string
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> : ^^^^^^
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>payload : Ref<string>
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> : ^^^^^^^^^^^
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>current : string
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> : ^^^^^^
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data.prepared;
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>data.prepared : boolean
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> : ^^^^^^^
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>data : Data
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> : ^^^^
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>prepared : boolean
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> : ^^^^^^^
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data.payload;
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>data.payload : string | null
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> : ^^^^^^^^^^^^^
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>data : Data
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> : ^^^^
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>payload : string | null
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> : ^^^^^^^^^^^^^
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}
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if (data.prepared) {
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>data.prepared : boolean
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> : ^^^^^^^
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>data : Data
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> : ^^^^
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>prepared : boolean
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> : ^^^^^^^
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prepared.current;
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>prepared.current : boolean
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> : ^^^^^^^
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>prepared : Ref<true> | Ref<false>
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> : ^^^^^^^^^^^^^^^^^^^^^^
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>current : boolean
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> : ^^^^^^^
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|
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payload.current;
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>payload.current : string | null
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> : ^^^^^^^^^^^^^
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>payload : Ref<string> | Ref<null>
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> : ^^^^^^^^^^^^^^^^^^^^^^^
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>current : string | null
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> : ^^^^^^^^^^^^^
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data.prepared;
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>data.prepared : true
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> : ^^^^
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>data : DataPrepared
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> : ^^^^^^^^^^^^
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>prepared : true
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> : ^^^^
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data.payload;
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>data.payload : string
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> : ^^^^^^
|
||||
>data : DataPrepared
|
||||
> : ^^^^^^^^^^^^
|
||||
>payload : string
|
||||
> : ^^^^^^
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,45 @@
|
|||
// @strict: true
|
||||
// @target: es2015
|
||||
|
||||
interface Ref<T> { current: T };
|
||||
type ToRefs<T> = { [K in keyof T]: Ref<T[K]> };
|
||||
declare function toRefs<T>(o: T): ToRefs<T>;
|
||||
|
||||
interface DataPrepared {
|
||||
prepared: true
|
||||
payload: string
|
||||
};
|
||||
|
||||
interface DataPending {
|
||||
prepared: false
|
||||
payload: null
|
||||
};
|
||||
|
||||
type Data = DataPrepared | DataPending;
|
||||
|
||||
declare function isDataRefsPrepared(refs: ToRefs<Data>): refs is ToRefs<DataPrepared>;
|
||||
|
||||
declare const data: Data;
|
||||
const dataRefs = toRefs(data);
|
||||
const { prepared, payload } = dataRefs;
|
||||
|
||||
if (prepared.current) {
|
||||
prepared.current;
|
||||
payload.current;
|
||||
data.prepared;
|
||||
data.payload;
|
||||
}
|
||||
|
||||
if (isDataRefsPrepared(dataRefs)) {
|
||||
prepared.current;
|
||||
payload.current;
|
||||
data.prepared;
|
||||
data.payload;
|
||||
}
|
||||
|
||||
if (data.prepared) {
|
||||
prepared.current;
|
||||
payload.current;
|
||||
data.prepared;
|
||||
data.payload;
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче