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ralph/test1-output.txt

Last active August 23, 2024 08:33
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  1. ralph revised this gist Jun 21, 2023. No changes.
  2. ralph revised this gist Jun 21, 2023. No changes.
  3. ralph created this gist Jun 21, 2023.
    12 changes: 12 additions & 0 deletions test1-output.txt
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    src/test.ts:10:39 - error TS18049: 'item' is possibly 'null' or 'undefined'.

    10 strings.forEach((item) => console.log(item.id, item.label))
    ~~~~

    src/test.ts:10:48 - error TS18049: 'item' is possibly 'null' or 'undefined'.

    10 strings.forEach((item) => console.log(item.id, item.label))
    ~~~~


    Found 2 errors in the same file, starting at: src/test.ts
    10 changes: 10 additions & 0 deletions test1.ts
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    const stringsAndNull = [
    { id: 1, label: 'foo' },
    { id: 2, label: 'bar' },
    null,
    { id: 3, label: 'test' },
    undefined,
    { id: 3, label: 'lol' },
    ]
    const strings = stringsAndNull.filter((item) => item != null)
    strings.forEach((item) => console.log(item.id, item.label))
    7 changes: 7 additions & 0 deletions test2-output.txt
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    src/test.ts:10:17 - error TS2345: Argument of type '(item: { id: number; label: string;}) => void' is not assignable to parameter of type '(value: { id: number; label: string; } | null | undefined, index: number, array: ({ id: number; label: string; } | null | undefined)[]) => void'.
    Types of parameters 'item' and 'value' are incompatible.
    Type '{ id: number; label: string; } | null | undefined' is not assignable to type '{ id: number; label: string; }'.
    Type 'undefined' is not assignable to type '{ id: number; label: string; }'.

    10 strings.forEach((item: { id: number, label: string}) => console.log(item.id, item.label))
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    10 changes: 10 additions & 0 deletions test2.ts
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    const stringsAndNull = [
    { id: 1, label: 'foo' },
    { id: 2, label: 'bar' },
    null,
    { id: 3, label: 'test' },
    undefined,
    { id: 3, label: 'lol' },
    ]
    const strings = stringsAndNull.filter((item) => item != null)
    strings.forEach((item: { id: number, label: string }) => console.log(item.id, item.label))