Typescript types.

types.ts

From the codes I wrote 3 years ago. Find code from my cloud storage.

        interface KeyValue1 {
            [key: string]: string[];
        }
        const test1: KeyValue1 = {
            "key1": ["value1"],
            "key2": ["value2"],
        };
        console.log(JSON.stringify(test1));

        interface KeyValue2 {
            [key: string]: string;
        }
        const test2: KeyValue2 = {
            "key1": "value1",
            "key2": "value2",
        };
        console.log(JSON.stringify(test2));

        interface KeyValue3 {    // Actually, key field in the definition of type is not that important.
            [a: string]: string;
        }
        const test3: KeyValue3 = {
            "key1": "value1",
            "key2": "value2",
        };
        console.log(JSON.stringify(test3));

        interface KeyValue4 {
            [key: number]: string;
        }
        const test4: KeyValue4 = {
            1: "value1",
            2: "value2",
        };
        console.log(JSON.stringify(test4));

        const test11: KeyValue1[] = [
            {
                "key1": ["value1"],
                "key2": ["value2"],
            }, {
                "key3": ["value3"],
                "key4": ["value4"],
            }
        ];
        console.log(JSON.stringify(test11));