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Adding test
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‎tests/baselines/reference/objectLiteralExcessProperties.errors.txt

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tests/cases/compiler/objectLiteralExcessProperties.ts(9,18): error TS2322: Type '{ forword: string; }' is not assignable to type 'Book'.
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Object literal may only specify known properties, and 'forword' does not exist in type 'Book'.
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tests/cases/compiler/objectLiteralExcessProperties.ts(11,27): error TS2322: Type '{ foreward: string; }' is not assignable to type 'Book | string'.
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Object literal may only specify known properties, and 'foreward' does not exist in type 'Book | string'.
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tests/cases/compiler/objectLiteralExcessProperties.ts(13,53): error TS2322: Type '({ foreword: string; } | { forwards: string; })[]' is not assignable to type 'Book | Book[]'.
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Type '({ foreword: string; } | { forwards: string; })[]' is not assignable to type 'Book[]'.
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Type '{ foreword: string; } | { forwards: string; }' is not assignable to type 'Book'.
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Type '{ forwards: string; }' is not assignable to type 'Book'.
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Object literal may only specify known properties, and 'forwards' does not exist in type 'Book'.
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tests/cases/compiler/objectLiteralExcessProperties.ts(15,42): error TS2322: Type '{ foreword: string; colour: string; }' is not assignable to type 'Book & Cover'.
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Object literal may only specify known properties, and 'colour' does not exist in type 'Book & Cover'.
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tests/cases/compiler/objectLiteralExcessProperties.ts(17,26): error TS2322: Type '{ foreward: string; color: string; }' is not assignable to type 'Book & Cover'.
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Object literal may only specify known properties, and 'foreward' does not exist in type 'Book & Cover'.
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tests/cases/compiler/objectLiteralExcessProperties.ts(19,57): error TS2322: Type '{ foreword: string; color: string; price: number; }' is not assignable to type 'Book & Cover'.
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Object literal may only specify known properties, and 'price' does not exist in type 'Book & Cover'.
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tests/cases/compiler/objectLiteralExcessProperties.ts(21,43): error TS2322: Type '{ foreword: string; price: number; }' is not assignable to type 'Book & number'.
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Object literal may only specify known properties, and 'price' does not exist in type 'Book & number'.
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==== tests/cases/compiler/objectLiteralExcessProperties.ts (7 errors) ====
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interface Book {
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foreword: string;
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}
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interface Cover {
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color?: string;
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}
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var b1: Book = { forword: "oops" };
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~~~~~~~~~~~~~~~
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!!! error TS2322: Type '{ forword: string; }' is not assignable to type 'Book'.
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!!! error TS2322: Object literal may only specify known properties, and 'forword' does not exist in type 'Book'.
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var b2: Book | string = { foreward: "nope" };
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~~~~~~~~~~~~~~~~
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!!! error TS2322: Type '{ foreward: string; }' is not assignable to type 'Book | string'.
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!!! error TS2322: Object literal may only specify known properties, and 'foreward' does not exist in type 'Book | string'.
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var b3: Book | (Book[]) = [{ foreword: "hello" }, { forwards: "back" }];
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~~~~~~~~~~~~~~~~
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!!! error TS2322: Type '({ foreword: string; } | { forwards: string; })[]' is not assignable to type 'Book | Book[]'.
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!!! error TS2322: Type '({ foreword: string; } | { forwards: string; })[]' is not assignable to type 'Book[]'.
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!!! error TS2322: Type '{ foreword: string; } | { forwards: string; }' is not assignable to type 'Book'.
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!!! error TS2322: Type '{ forwards: string; }' is not assignable to type 'Book'.
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!!! error TS2322: Object literal may only specify known properties, and 'forwards' does not exist in type 'Book'.
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var b4: Book & Cover = { foreword: "hi", colour: "blue" };
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~~~~~~~~~~~~~~
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!!! error TS2322: Type '{ foreword: string; colour: string; }' is not assignable to type 'Book & Cover'.
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!!! error TS2322: Object literal may only specify known properties, and 'colour' does not exist in type 'Book & Cover'.
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var b5: Book & Cover = { foreward: "hi", color: "blue" };
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~~~~~~~~~~~~~~
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!!! error TS2322: Type '{ foreward: string; color: string; }' is not assignable to type 'Book & Cover'.
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!!! error TS2322: Object literal may only specify known properties, and 'foreward' does not exist in type 'Book & Cover'.
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var b6: Book & Cover = { foreword: "hi", color: "blue", price: 10.99 };
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~~~~~~~~~~~~
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!!! error TS2322: Type '{ foreword: string; color: string; price: number; }' is not assignable to type 'Book & Cover'.
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!!! error TS2322: Object literal may only specify known properties, and 'price' does not exist in type 'Book & Cover'.
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var b7: Book & number = { foreword: "hi", price: 10.99 };
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~~~~~~~~~~~~
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!!! error TS2322: Type '{ foreword: string; price: number; }' is not assignable to type 'Book & number'.
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!!! error TS2322: Object literal may only specify known properties, and 'price' does not exist in type 'Book & number'.
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‎tests/baselines/reference/objectLiteralExcessProperties.js

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//// [objectLiteralExcessProperties.ts]
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interface Book {
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foreword: string;
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}
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interface Cover {
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color?: string;
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}
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var b1: Book = { forword: "oops" };
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var b2: Book | string = { foreward: "nope" };
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var b3: Book | (Book[]) = [{ foreword: "hello" }, { forwards: "back" }];
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var b4: Book & Cover = { foreword: "hi", colour: "blue" };
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var b5: Book & Cover = { foreward: "hi", color: "blue" };
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var b6: Book & Cover = { foreword: "hi", color: "blue", price: 10.99 };
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var b7: Book & number = { foreword: "hi", price: 10.99 };
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//// [objectLiteralExcessProperties.js]
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var b1 = { forword: "oops" };
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var b2 = { foreward: "nope" };
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var b3 = [{ foreword: "hello" }, { forwards: "back" }];
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var b4 = { foreword: "hi", colour: "blue" };
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var b5 = { foreward: "hi", color: "blue" };
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var b6 = { foreword: "hi", color: "blue", price: 10.99 };
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var b7 = { foreword: "hi", price: 10.99 };

‎tests/cases/compiler/objectLiteralExcessProperties.ts

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interface Book {
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foreword: string;
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}
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interface Cover {
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color?: string;
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}
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var b1: Book = { forword: "oops" };
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var b2: Book | string = { foreward: "nope" };
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var b3: Book | (Book[]) = [{ foreword: "hello" }, { forwards: "back" }];
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var b4: Book & Cover = { foreword: "hi", colour: "blue" };
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var b5: Book & Cover = { foreward: "hi", color: "blue" };
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var b6: Book & Cover = { foreword: "hi", color: "blue", price: 10.99 };
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var b7: Book & number = { foreword: "hi", price: 10.99 };

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