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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
/** FillOption Object */export interface FillOption {  /** Char to fill in */  char?: string;  /** Side to fill in */  side?: "left" | "right";  /** If strict, output string can't be greater than strLen*/  strict?: boolean;  /** char/string used to specify the string has been truncated */  strictChar?: string;  /** Side of truncate */  strictSide?: "left" | "right";}
/** * Pad helper for strings. * Input string is processed to output a string with a minimal length. * If the parameter `strict` is set to true, the output string length * is equal to the `strLen` parameter. * Example: * *     pad("deno", 6, { char: "*", side: "left" }) // output : "**deno" *     pad("deno", 6, { char: "*", side: "right"}) // output : "deno**" *     pad("denosorusrex", 6 { *       char: "*", *       side: "left", *       strict: true, *       strictSide: "right", *       strictChar: "..." *     }) // output : "den..." * * @param input Input string * @param strLen Output string lenght * @param opts Configuration object * @param [opts.char=" "] Character used to fill in * @param [opts.side="left"] Side to fill in * @param [opts.strict=false] Flag to truncate the string if length > strLen * @param [opts.strictChar=""] Character to add if string is truncated * @param [opts.strictSide="right"] Side to truncate */export function pad(  input: string,  strLen: number,  opts: FillOption = {    char: " ",    strict: false,    side: "left",    strictChar: "",    strictSide: "right"  }): string {  let out = input;  const outL = out.length;  if (outL < strLen) {    if (!opts.side || opts.side === "left") {      out = out.padStart(strLen, opts.char);    } else {      out = out.padEnd(strLen, opts.char);    }  } else if (opts.strict && outL > strLen) {    const addChar = opts.strictChar ? opts.strictChar : "";    if (opts.strictSide === "left") {      let toDrop = outL - strLen;      if (opts.strictChar) {        toDrop += opts.strictChar.length;      }      out = `${addChar}${out.slice(toDrop, outL)}`;    } else {      out = `${out.substring(0, strLen - addChar.length)}${addChar}`;    }  }  return out;}