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Control flow analysis for element access with variable index #57847
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aed5fc0
CFA for obj[key] where key is constant variable or parameter
ahejlsberg 8676121
Accept new baselines
ahejlsberg 2ce7c15
Add tests
ahejlsberg 95818c0
Fully compare references
ahejlsberg aa68fd8
Minor optimization
ahejlsberg 8a277ec
Restore original resolveEntityName call
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134 changes: 134 additions & 0 deletions
134
tests/baselines/reference/controlFlowComputedPropertyNames.symbols
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| //// [tests/cases/conformance/controlFlow/controlFlowComputedPropertyNames.ts] //// | ||
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| === controlFlowComputedPropertyNames.ts === | ||
| function f1(obj: Record<string, unknown>, key: string) { | ||
| >f1 : Symbol(f1, Decl(controlFlowComputedPropertyNames.ts, 0, 0)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 0, 12)) | ||
| >Record : Symbol(Record, Decl(lib.es5.d.ts, --, --)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 0, 41)) | ||
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| if (typeof obj[key] === "string") { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 0, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 0, 41)) | ||
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 0, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 0, 41)) | ||
| >toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| } | ||
| } | ||
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| function f2(obj: Record<string, string | undefined>, key: string) { | ||
| >f2 : Symbol(f2, Decl(controlFlowComputedPropertyNames.ts, 4, 1)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 6, 12)) | ||
| >Record : Symbol(Record, Decl(lib.es5.d.ts, --, --)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 6, 52)) | ||
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| if (obj[key] !== undefined) { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 6, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 6, 52)) | ||
| >undefined : Symbol(undefined) | ||
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 6, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 6, 52)) | ||
| >toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| } | ||
| let key2 = key + key; | ||
| >key2 : Symbol(key2, Decl(controlFlowComputedPropertyNames.ts, 10, 7)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 6, 52)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 6, 52)) | ||
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| if (obj[key2] !== undefined) { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 6, 12)) | ||
| >key2 : Symbol(key2, Decl(controlFlowComputedPropertyNames.ts, 10, 7)) | ||
| >undefined : Symbol(undefined) | ||
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| obj[key2].toUpperCase(); | ||
| >obj[key2].toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 6, 12)) | ||
| >key2 : Symbol(key2, Decl(controlFlowComputedPropertyNames.ts, 10, 7)) | ||
| >toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| } | ||
| const key3 = key + key; | ||
| >key3 : Symbol(key3, Decl(controlFlowComputedPropertyNames.ts, 14, 9)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 6, 52)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 6, 52)) | ||
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| if (obj[key3] !== undefined) { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 6, 12)) | ||
| >key3 : Symbol(key3, Decl(controlFlowComputedPropertyNames.ts, 14, 9)) | ||
| >undefined : Symbol(undefined) | ||
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| obj[key3].toUpperCase(); | ||
| >obj[key3].toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 6, 12)) | ||
| >key3 : Symbol(key3, Decl(controlFlowComputedPropertyNames.ts, 14, 9)) | ||
| >toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| } | ||
| } | ||
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| type Thing = { a?: string, b?: number, c?: number }; | ||
| >Thing : Symbol(Thing, Decl(controlFlowComputedPropertyNames.ts, 18, 1)) | ||
| >a : Symbol(a, Decl(controlFlowComputedPropertyNames.ts, 20, 14)) | ||
| >b : Symbol(b, Decl(controlFlowComputedPropertyNames.ts, 20, 26)) | ||
| >c : Symbol(c, Decl(controlFlowComputedPropertyNames.ts, 20, 38)) | ||
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| function f3(obj: Thing, key: keyof Thing) { | ||
| >f3 : Symbol(f3, Decl(controlFlowComputedPropertyNames.ts, 20, 52)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 22, 12)) | ||
| >Thing : Symbol(Thing, Decl(controlFlowComputedPropertyNames.ts, 18, 1)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 22, 23)) | ||
| >Thing : Symbol(Thing, Decl(controlFlowComputedPropertyNames.ts, 18, 1)) | ||
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| if (obj[key] !== undefined) { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 22, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 22, 23)) | ||
| >undefined : Symbol(undefined) | ||
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| if (typeof obj[key] === "string") { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 22, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 22, 23)) | ||
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 22, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 22, 23)) | ||
| >toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| } | ||
| if (typeof obj[key] === "number") { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 22, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 22, 23)) | ||
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| obj[key].toFixed(); | ||
| >obj[key].toFixed : Symbol(Number.toFixed, Decl(lib.es5.d.ts, --, --)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 22, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 22, 23)) | ||
| >toFixed : Symbol(Number.toFixed, Decl(lib.es5.d.ts, --, --)) | ||
| } | ||
| } | ||
| } | ||
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| function f4<K extends string>(obj: Record<K, string | undefined>, key: K) { | ||
| >f4 : Symbol(f4, Decl(controlFlowComputedPropertyNames.ts, 31, 1)) | ||
| >K : Symbol(K, Decl(controlFlowComputedPropertyNames.ts, 33, 12)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 33, 30)) | ||
| >Record : Symbol(Record, Decl(lib.es5.d.ts, --, --)) | ||
| >K : Symbol(K, Decl(controlFlowComputedPropertyNames.ts, 33, 12)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 33, 65)) | ||
| >K : Symbol(K, Decl(controlFlowComputedPropertyNames.ts, 33, 12)) | ||
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| if (obj[key]) { | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 33, 30)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 33, 65)) | ||
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| >obj : Symbol(obj, Decl(controlFlowComputedPropertyNames.ts, 33, 30)) | ||
| >key : Symbol(key, Decl(controlFlowComputedPropertyNames.ts, 33, 65)) | ||
| >toUpperCase : Symbol(String.toUpperCase, Decl(lib.es5.d.ts, --, --)) | ||
| } | ||
| } | ||
|
|
163 changes: 163 additions & 0 deletions
163
tests/baselines/reference/controlFlowComputedPropertyNames.types
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| //// [tests/cases/conformance/controlFlow/controlFlowComputedPropertyNames.ts] //// | ||
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| === controlFlowComputedPropertyNames.ts === | ||
| function f1(obj: Record<string, unknown>, key: string) { | ||
| >f1 : (obj: Record<string, unknown>, key: string) => void | ||
| >obj : Record<string, unknown> | ||
| >key : string | ||
|
|
||
| if (typeof obj[key] === "string") { | ||
| >typeof obj[key] === "string" : boolean | ||
| >typeof obj[key] : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function" | ||
| >obj[key] : unknown | ||
| >obj : Record<string, unknown> | ||
| >key : string | ||
| >"string" : "string" | ||
|
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase() : string | ||
| >obj[key].toUpperCase : () => string | ||
| >obj[key] : string | ||
| >obj : Record<string, unknown> | ||
| >key : string | ||
| >toUpperCase : () => string | ||
| } | ||
| } | ||
|
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| function f2(obj: Record<string, string | undefined>, key: string) { | ||
| >f2 : (obj: Record<string, string | undefined>, key: string) => void | ||
| >obj : Record<string, string | undefined> | ||
| >key : string | ||
|
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| if (obj[key] !== undefined) { | ||
| >obj[key] !== undefined : boolean | ||
| >obj[key] : string | undefined | ||
| >obj : Record<string, string | undefined> | ||
| >key : string | ||
| >undefined : undefined | ||
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase() : string | ||
| >obj[key].toUpperCase : () => string | ||
| >obj[key] : string | ||
| >obj : Record<string, string | undefined> | ||
| >key : string | ||
| >toUpperCase : () => string | ||
| } | ||
| let key2 = key + key; | ||
| >key2 : string | ||
| >key + key : string | ||
| >key : string | ||
| >key : string | ||
|
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| if (obj[key2] !== undefined) { | ||
| >obj[key2] !== undefined : boolean | ||
| >obj[key2] : string | undefined | ||
| >obj : Record<string, string | undefined> | ||
| >key2 : string | ||
| >undefined : undefined | ||
|
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| obj[key2].toUpperCase(); | ||
| >obj[key2].toUpperCase() : string | ||
| >obj[key2].toUpperCase : () => string | ||
| >obj[key2] : string | ||
| >obj : Record<string, string | undefined> | ||
| >key2 : string | ||
| >toUpperCase : () => string | ||
| } | ||
| const key3 = key + key; | ||
| >key3 : string | ||
| >key + key : string | ||
| >key : string | ||
| >key : string | ||
|
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| if (obj[key3] !== undefined) { | ||
| >obj[key3] !== undefined : boolean | ||
| >obj[key3] : string | undefined | ||
| >obj : Record<string, string | undefined> | ||
| >key3 : string | ||
| >undefined : undefined | ||
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| obj[key3].toUpperCase(); | ||
| >obj[key3].toUpperCase() : string | ||
| >obj[key3].toUpperCase : () => string | ||
| >obj[key3] : string | ||
| >obj : Record<string, string | undefined> | ||
| >key3 : string | ||
| >toUpperCase : () => string | ||
| } | ||
| } | ||
|
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| type Thing = { a?: string, b?: number, c?: number }; | ||
| >Thing : { a?: string | undefined; b?: number | undefined; c?: number | undefined; } | ||
| >a : string | undefined | ||
| >b : number | undefined | ||
| >c : number | undefined | ||
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| function f3(obj: Thing, key: keyof Thing) { | ||
| >f3 : (obj: Thing, key: keyof Thing) => void | ||
| >obj : Thing | ||
| >key : keyof Thing | ||
|
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| if (obj[key] !== undefined) { | ||
| >obj[key] !== undefined : boolean | ||
| >obj[key] : string | number | undefined | ||
| >obj : Thing | ||
| >key : keyof Thing | ||
| >undefined : undefined | ||
|
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| if (typeof obj[key] === "string") { | ||
| >typeof obj[key] === "string" : boolean | ||
| >typeof obj[key] : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function" | ||
| >obj[key] : string | number | ||
| >obj : Thing | ||
| >key : keyof Thing | ||
| >"string" : "string" | ||
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase() : string | ||
| >obj[key].toUpperCase : () => string | ||
| >obj[key] : string | ||
| >obj : Thing | ||
| >key : keyof Thing | ||
| >toUpperCase : () => string | ||
| } | ||
| if (typeof obj[key] === "number") { | ||
| >typeof obj[key] === "number" : boolean | ||
| >typeof obj[key] : "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function" | ||
| >obj[key] : string | number | ||
| >obj : Thing | ||
| >key : keyof Thing | ||
| >"number" : "number" | ||
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| obj[key].toFixed(); | ||
| >obj[key].toFixed() : string | ||
| >obj[key].toFixed : (fractionDigits?: number | undefined) => string | ||
| >obj[key] : number | ||
| >obj : Thing | ||
| >key : keyof Thing | ||
| >toFixed : (fractionDigits?: number | undefined) => string | ||
| } | ||
| } | ||
| } | ||
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| function f4<K extends string>(obj: Record<K, string | undefined>, key: K) { | ||
| >f4 : <K extends string>(obj: Record<K, string | undefined>, key: K) => void | ||
| >obj : Record<K, string | undefined> | ||
| >key : K | ||
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| if (obj[key]) { | ||
| >obj[key] : Record<K, string | undefined>[K] | ||
| >obj : Record<K, string | undefined> | ||
| >key : K | ||
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| obj[key].toUpperCase(); | ||
| >obj[key].toUpperCase() : string | ||
| >obj[key].toUpperCase : () => string | ||
| >obj[key] : string | ||
| >obj : Record<K, string | undefined> | ||
| >key : K | ||
| >toUpperCase : () => string | ||
| } | ||
| } | ||
|
|
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Does it make more sense to do
isPastLastAssignmentusing a more specific location? How does this PR interact with #56908?There was a problem hiding this comment.
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Unfortunately not that simple. We would need to know that all narrowing operations for
obj[key]occur past the last assignment tokeywhich would require an additional CFA graph walk. We don't have that issue in #56908 because the only location we care about is the location where the arrow function is created.There was a problem hiding this comment.
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Makes sense; I really need to prototype the idea I had to make that efficient enough for us to do, but I've lost that brainwave☹️
Can you add a test in the vein of #56908 in terms of what closures do? Something like: Playground Link (which does behave properly I think)
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Such a test wouldn't show anything. The new analysis in #56908 only affects references to local variables, not references to properties, so there are no changes across closure boundaries with this PR.