59 lines
1.3 KiB
TypeScript
59 lines
1.3 KiB
TypeScript
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const isString = (text: unknown): text is string => {
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return typeof text === "string" || text instanceof String;
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};
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const parseString = (data: unknown): string => {
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if (!isString(data)) {
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throw new Error("data is not a string");
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}
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return data;
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};
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const isNumber = (number: unknown): number is number => {
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return typeof number === "number" && !isNaN(number);
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};
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const parseNumber = (data: unknown): number => {
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if (!isNumber(data)) {
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throw new Error("data is not a number");
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}
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return Number(data);
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};
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const isDate = (date: string) => {
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if (!Date.parse(date)) {
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throw new Error("invalid date");
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}
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return date;
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};
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const parseDateNumber = (date: unknown): string => {
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if (!isString(date) || !isDate(date)) {
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throw new Error("date could not be parsed");
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}
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return date;
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};
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const parseEmail = (email: unknown): string => {
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if (!isString(email)) {
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throw new Error("incorrect email");
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}
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return email;
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};
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const isBoolean = (booleanCandidate: unknown): booleanCandidate is boolean => {
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return typeof booleanCandidate === "boolean";
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};
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const parseBoolean = (booleanCandidate: unknown): boolean => {
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if (!isBoolean(booleanCandidate)) {
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throw new Error("argument was not a boolean");
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}
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return booleanCandidate;
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};
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export { isString, isNumber, parseString, parseNumber, parseDateNumber, parseBoolean, parseEmail };
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