3d235b42a0
* Initial implementation + tests * linty * Support destructuring declarations and assignments * lint * Fix destructuring assignment and element access into known properties * Update baselines * Rename flag to unUncheckedIndexedAccess * Add test for unique symbol indexing * Fix flag order in baselines Co-authored-by: Andrew Branch <andrew@wheream.io>
64 lines
1.8 KiB
TypeScript
64 lines
1.8 KiB
TypeScript
// @strict: true
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// @noUncheckedIndexedAccess: true
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declare const strArray: string[];
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declare const strStrTuple: [string, string];
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// Declaration forms for array destructuring
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// Destructuring from a simple array -> include undefined
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const [s1] = strArray;
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s1.toString(); // Should error, s1 possibly undefined
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// Destructuring a rest element -> do not include undefined
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const [...s2] = strArray;
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s2.push(undefined); // Should error, 'undefined' not part of s2's element type
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// Destructuring a rest element -> do not include undefined
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const [, , ...s3] = strArray;
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s3.push(undefined); // Should error, 'undefined' not part of s2's element type
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// Declaration forms for object destructuring
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declare const strMap: { [s: string]: string };
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const { t1 } = strMap;
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t1.toString(); // Should error, t1 possibly undefined
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const { ...t2 } = strMap;
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t2.z.toString(); // Should error
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// Test intersections with declared properties
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declare const numMapPoint: { x: number, y: number} & { [s: string]: number };
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{
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const { x, y, z } = numMapPoint;
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x.toFixed(); // Should OK
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y.toFixed(); // Should OK
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z.toFixed(); // Should error
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}
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{
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const { x, ...q } = numMapPoint;
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x.toFixed(); // Should OK
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q.y.toFixed(); // Should OK
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q.z.toFixed(); // Should error
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}
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declare let target_string: string;
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declare let target_string_undef: string | undefined;
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declare let target_string_arr: string[];
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// Assignment forms
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[target_string] = strArray; // Should error
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[target_string_undef] = strArray; // Should OK
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[,,, ...target_string_arr] = strArray; // Should OK
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{
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let x: number, y: number, z: number | undefined;
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({ x, y, z } = numMapPoint); // Should OK
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let q: number;
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({ q } = numMapPoint); // Should error
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}
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