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just-compose

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return a function composed of 2 or more functions

github.com/angus-c/just

angus-c/just

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import compose = require('./index'); // Fixtures let fa: (s: string, n: number) => boolean; let fb: (b: boolean) => []; let fc: (c: []) => 0; let fd: (d: 0) => ''; let fe: (e: '') => null; let ff: (f: null) => void; let fx: (x: boolean) => boolean; // OK // Single argument let sa: (s: string, n: number) => boolean = compose(fa); let sb: (s: string, n: number, b: boolean) => boolean = compose(fa); // Multiple arguments let ma: (s: string, n: number) => [] = compose(fa, fb); let mb: (s: string, n: number) => 0 = compose(fa, fb, fc); let mc: (s: string, n: number) => '' = compose(fa, fb, fc, fd); let md: (s: string, n: number) => null = compose(fa, fb, fc, fd, fe); let me: (s: string, n: number) => void = compose(fa, fb, fc, fd, fe, ff); let mf: (s: string, n: number) => boolean = compose(fa, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx); let mg: (s: string, n: number) => [] = compose(fa, fb, fc, fd, fe, ff, fx, fb); // Example code in README const sqRootBiggest: (...xs: number[]) => number = compose(Math.max, Math.sqrt, Math.trunc); // Not OK // Single argument // @ts-expect-error let sae: (s: string, n: number) => string = compose(fa); // @ts-expect-error let sbe: (s: string, n: string) => boolean = compose(fa); // @ts-expect-error let sce: (s: string) => boolean = compose(fa); // @ts-expect-error compose(0); // @ts-expect-error compose(''); // @ts-expect-error compose({}); // Multiple arguments // @ts-expect-error compose(fa, fc); // @ts-expect-error compose(fa, fb, fd); // @ts-expect-error compose(fa, fb, fc, fe); // @ts-expect-error compose(fa, fb, fc, fd, ff); // @ts-expect-error compose(fa, fb, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx); // @ts-expect-error let mae: (s: string, n: number) => string = compose(fa, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx); // @ts-expect-error compose(0, fb); // @ts-expect-error compose(fa, 0); // @ts-expect-error compose(fa, fb, 0); // @ts-expect-error compose(fa, fb, fc, 0); // @ts-expect-error compose(fa, fb, fc, fd, 0); // @ts-expect-error compose(fa, fb, fc, fd, fe, 0); // @ts-expect-error compose(fa, fb, fc, fd, fe, ff, 0); // @ts-expect-error compose(fa, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, fx, 0);