人只有在人们中间才能认识自己。——歌德

题目：

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declare module 'str-utils' {
    // export const ...
    // export function ...
}

报错：

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index.ts(2,5): error TS2305: Module '"str-utils"' has no exported member 'strReverse'.
index.ts(3,5): error TS2305: Module '"str-utils"' has no exported member 'strToLower'.
index.ts(4,5): error TS2305: Module '"str-utils"' has no exported member 'strToUpper'.
index.ts(5,5): error TS2305: Module '"str-utils"' has no exported member 'strRandomize'.
index.ts(6,5): error TS2305: Module '"str-utils"' has no exported member 'strInvertCase'.
test.ts(5,5): error TS2344: Type 'false' does not satisfy the constraint 'true'.

答案：

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declare module 'str-utils' {

    /**
     * Reverses a string.
     * @param {String} value
     * @return {String}
     */
    export function strReverse(value: string): string

    /**
     * Converts a string to lower case.
     * @param {String} value
     * @return {String}
     */
    export function strToLower(value: string): string

    /**
     * Converts a string to upper case.
     * @param {String} value
     * @return {String}
     */
    export function strToUpper(value: string): string

    /**
     * Randomizes characters of a string.
     * @param {String} value
     * @return {String}
     */
    export function strRandomize(value: string): string

    /**
     * Inverts case of a string.
     * @param {String} value
     * @return {String}
     */
    export function strInvertCase(value: string) :string

}