chore: adds *.d.ts

.eslintignore

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+*.d.ts

src/array-to-list.d.ts

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+/**
+ * Array to list.
+ *
+ * @param input
+ */
+declare function arrayToList(input: any): string;

src/errorf.d.ts

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+/**
+ * Errorf.
+ */
+declare class Errorf extends Error {
+  /**
+   * Constructor.
+   *
+   * @param pattern
+   * @param args
+   */
+  constructor(pattern: string, ...args: any[]);
+}

src/format.d.ts

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+/**
+ * Format.
+ *
+ * native:
+ * s - string
+ * d - digits
+ * j - json
+ *
+ * extras:
+ * v - value (valueToString.js)
+ * l - list (arrayToList.js)
+ *
+ * @param pattern
+ * @param args
+ */
+declare function format(pattern: string, ...args: any[]): string;

src/value-to-string.d.ts

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+/**
+ * Value to string.
+ *
+ * @param input
+ */
+declare function valueToString(input: any): string;