npm-install-peer-dependencies

#!/usr/bin/env bash
set -euo pipefail

NPM_INSTALL_CMD="${NPM_INSTALL_CMD:-npm install --no-save}"
NPM_SORT_DEV_CMD="${NPM_SORT_DEV_CMD:-npm remove --save-dev some-pkg-that-doesnt-exist}"

# https://stackoverflow.com/a/246128/465684
SOURCE=${BASH_SOURCE[0]}
# resolve $SOURCE until the file is no longer a symlink
while [[ -h ${SOURCE} ]]; do
  DIR=$(cd -P $(dirname ${SOURCE}) && pwd)
  SOURCE=$(readlink ${SOURCE})
  # if $SOURCE was a relative symlink
  # we need to resolve it relative to the path where the symlink file was locate
  [[ ${SOURCE} != /* ]] && SOURCE=${DIR}/${SOURCE}
done
DIR=$(cd -P $(dirname ${SOURCE}) && pwd)

function exe() {
  echo "$(pwd)\$ $*"
  "$@"
}

{
  node -e " \
    peerDeps = require('${DIR}/package.json').peerDependencies; \
    Object.keys(peerDeps).forEach(function(name) { \
        console.log(name + '\t' + peerDeps[name]); \
    }); \
    "
  node -e " \
    peerDeps = require('${DIR}/package.json').optionalPeerDependencies; \
    Object.keys(peerDeps).forEach(function(name) { \
        console.log(name + '\t' + peerDeps[name] + '\t' + 'optional'); \
    }); \
    "
} | {
  NPM_PEER_DEPS=
  while read -r LINE; do
    NAME=$(echo "${LINE}" | cut -d $'\t' -f 1)
    VSN=$(echo "${LINE}" | cut -d $'\t' -f 2)
    OPTIONAL=$(echo "${LINE}" | cut -d $'\t' -f 3)

    # is the version already specified as dependency?
    IN_PACKAGE_JSON=false
    IN_PACKAGE_JSON=$(node -p "try { \
      var pkg = require('./package.json'); \
      var vsn = (pkg.dependencies || {})[\"${NAME}\"] || (pkg.devDependencies || {})[\"${NAME}\"]; \
      vsn === \"${VSN}\"; \
      } catch(err){false}" | \
      grep -q "^false$" && \
      echo "false" || echo "true")

    if [[ "${IN_PACKAGE_JSON}" = "true" ]]; then
      # and is it already installed (static spec), then skip
      node -p "try { \
        var pkg = require('./node_modules/${NAME}/package.json'); \
        pkg.version === \"${VSN}\"; \
        } catch(err){false}" | \
        grep -q "^false$" || \
        continue

      # and is it already installed (range spec), then skip
      node -p "try { \
        var pkg = require('./node_modules/${NAME}/package.json'); \
        (pkg._requested || {}).rawSpec === \"${VSN}\"; \
        } catch(err){false}" | \
        grep -q "^false$" || \
        continue
    elif [[ "${OPTIONAL}" = "optional" ]]; then
      # not, if optional and no version specified as dependency, then skip
      IN_PACKAGE_JSON=false
      IN_PACKAGE_JSON=$(node -p "try { \
        var pkg = require('./package.json'); \
        var vsn = (pkg.dependencies || {})[\"${NAME}\"] || (pkg.devDependencies || {})[\"${NAME}\"]; \
        vsn !== undefined; \
        } catch(err){false}" | \
        grep -q "^false$" && \
        echo "false" || echo "true")

      [[ "${IN_PACKAGE_JSON}" = "true" ]] || continue
    fi

    # https://github.com/stedolan/jq/issues/105#issuecomment-437363987
    # cat <<< "$(jq ".devDependencies += {\"${NAME}\": \"${VSN}\"}" < package.json)" > package.json
    npx json -q -I -f package.json -e "this.devDependencies = this.devDependencies || {}"
    npx json -q -I -f package.json -e "this.devDependencies[\"${NAME}\"] = \"${VSN}\""

    # NOTE: assumes all peerDeps have semver vers, not git urls, etc
    NPM_PEER_DEPS="${NPM_PEER_DEPS} ${NAME}@${VSN}"
  done
  [[ -z "${NPM_PEER_DEPS}" ]] || {
    ${NPM_INSTALL_CMD} ${NPM_PEER_DEPS}
    ${NPM_SORT_DEV_CMD}
  }
}