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

        # is the version already specified in dependencies or devDependencies?
        node -p "try { \
            var pkg = require('./package.json'); \
            var vsn = (pkg.dependencies || {})[\"${NAME}\"] || (pkg.devDependencies || {})[\"${NAME}\"]; \
            vsn === \"${VSN}\"; \
            } catch(err){false}" | \
            grep -q "^false$" || {
          # if yes, is it already installed (static spec)?
          node -p "try { \
              var pkg = require('./node_modules/${NAME}/package.json'); \
              pkg.version === \"${VSN}\"; \
              } catch(err){false}" | \
              grep -q "^false$" || \
              continue

          # if yes, is it already installed (range spec)?
          node -p "try { \
              var pkg = require('./node_modules/${NAME}/package.json'); \
              (pkg._requested || {}).rawSpec === \"${VSN}\"; \
              } catch(err){false}" | \
              grep -q "^false$" || \
              continue
        }

        # 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}
    }
}