marcogrcr

import("node:fs")
  .then(({ readFileSync, writeFileSync }) => {
    const packages = new Map();
    const output = [];
    readFileSync("yarn.lock")
      .toString()
      .split("\n")
      .forEach((l) => {
        if (l[0] === '"') {
          const [pkg] = l.split("@npm:");

marcogrcr

#!/bin/sh

# we use a heredoc for inliling the lines in the script, but they can be obtained from a file as well
# IMPORTANT: heredocs MUST use tabs, they cannot use space indentation
LINES=$(
	cat <<- EOF
		line1
		line2
		line3
	EOF

marcogrcr

import {
  afterEach,
  beforeEach,
  expect,
  it,
  MockedClass,
  MockedFunction,
  vi,
} from "vitest";

marcogrcr

AWS Lambda HTTP event comparison

AWS Lambda allows to create HTTP APIs fronted by API Gateway ([REST] and [HTTP]) and [ALB] (Application Load Balancer) endpoints. However, the input events vary depending on the endpoint. In order to write code that is compatible with all endpoint, certain differences need to be accounted for.

Methodology

The following endpoint configuration was applied to each endpoint type:

marcogrcr

#!/bin/sh

set -eu

echo 'Initializing test DynamoDB table...'

# https://docs.localstack.cloud/getting-started/installation/#docker
IMAGE=$(docker run \
  --rm -d \
  -p 127.0.0.1:4566:4566 \

marcogrcr

/**
 * A memory efficient string concatenation builder.
 * @example
 * const builder = new StringBuilder();
 * builder.append("Hello");
 * builder.append(", world!");
 *
 * // if you need the string
 * const str = builder.toString();
 *

marcogrcr

#!/bin/sh

folder_path='...'
file_types='*.json'

# See https://www.shellcheck.net/wiki/SC2044 for why we loop this way
find "$folder_path" ! -name "$(printf "*\n*")" -name "$file_types" | while IFS= read -r file
do
  echo "Processing $file..."
  # process $file

marcogrcr

export function diffBetweenTwoDates(start, end) {
  const startTime = new Date(start).valueOf();
  const endTime = new Date(end).valueOf();
  if (Number.isNaN(startTime)) throw new Error("Invalid start date");
  if (Number.isNaN(endTime)) throw new Error("Invalid end date");
  
  const fmt = (value, len = 2) => value.toString().padStart(len, "0");
  const diff = new Date(endTime - startTime);

  const diffNoTime = `${fmt(diff.getUTCFullYear(), 4)}-${fmt(diff.getUTCMonth() + 1)}-${fmt(diff.getUTCDate())}T00:00:00Z`;

marcogrcr

((selector) => Array
  .from(document.querySelectorAll(selector))
  .map(x => Array
    .from(Array(x.attributes.length).keys())
    .reduce((o, i) => ({ [x.attributes.item(i).name]: x.attributes.item(i).value, ...o }), {})
  )
)('meta')

marcogrcr

import { createServer } from "node:http";

export interface CreateEchoServerInput {
  /**
   * Indicates the echo mode.
   * - `"body"` creates a response controlled by the request body with an {@link EchoBody} shape.
   * - `"request"` echoes the request headers and body.
   * - `"request-in-body"` echo the request in a JSON object in the response body.
   * @default "request"
   */