tsc --init Created a new tsconfig.json with: TS target: es2016 module: commonjs strict: true esModuleInterop: true skipLibCheck: true forceConsistentCasingInFileNames: true You can learn more at https://aka.ms/tsconfig.json 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 现在...
If the package you are adding typings for is not on npm, set "nonNpm": true in the package.json, and make sure the name you choose for it does not conflict with the name of a package on npm. (You can use npm info <my-package> to check for the existence of the <my-package> ...
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Functions and operators like Object.assign, Object.keys, object spread ({ ...obj }), and for–in loops behave differently depending on whether or not a property actually exists on an object. In the case of our Person example, this could potentially lead to runtime errors if the age ...
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The fields inCameraOptionsare all optional because you might want to set just the center or zoom without changing the bearing or pitch. TheLngLattype also makessetCameraliberal in what it accepts: you can pass in a{lng, lat}object, a{lon, lat}object, or a[lng, lat]pair if you’re ...
If you use TypeScript, you can specify a type for some classes in the driver. All classes that accept a type parameter in the driver have the default type Document. The Document interface has the following definition: interface Document { [key: string]: any; } All object types extend the...
Fall through case in switch Not all code paths return a value Treating these as warnings is consistent with other tools, such as TSLint. These will still be displayed as errors when you runtscfrom the command line. You can disable this behavior by setting"typescript.reportStyleChecksAsWarnings...
You can write getters and setters with different types in object literals. function makeThing(): Thing { let size = 0; return { get size(): number { return size; }, set size(value: string | number | boolean) { let num = Number(value); // Don't allow NaN and stuff. if (!
TypeScript中的boolean类型对应于JavaScript中的Boolean原始类型。该类型能够表示两个逻辑值:true和false。 // boolean类型使用boolean关键字来表示constyes:boolean=trueconstno:boolean=false; string TypeScript中的string类型对应于JavaScript中的String原始类型。