Typescript

command.sh

# watch file
tsc -w --outDir ./build "test.ts"

typescript.ts

type Entities = 'leads_id' | 'company_id' | 'customers_id';

type Schema$Type = {
    [K in Entities]: number | number[] | string[];
};

interface SquareConfig {
    color?: string;
    width?: number;
    [propName: string]: any;
}