How to use the tsd.expectNotAssignable function in tsd
To help you get started, we’ve selected a few tsd examples, based on popular ways it is used in public projects.
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fregante / webext-storage-cache / index.test-d.ts View on Github 
import {expectType, expectNotAssignable, expectAssignable} from 'tsd';
import cache from '.';
type Primitive = boolean | number | string;
type Value = Primitive | Primitive[] | Record;
expectType>(cache.has('key'));
expectType>(cache.delete('key'));
expectType>(cache.get('key'));
expectType>(cache.get('key'));
expectNotAssignable>(cache.get('key'));
expectAssignable>(cache.set('key', 1));
expectAssignable>(cache.set('key', true));
expectAssignable>(cache.set('key', [true, 'string']));
expectAssignable>>(cache.set('key', {wow: [true, 'string']}));
expectAssignable>(cache.set('key', 1, 1));
