fix(NODE-4302): remove downlevel ts and typesVersions (#501)

.evergreen/config.yml

@@ -80,6 +80,19 @@ functions:
           ${PREPARE_SHELL}
           echo "NODE_VERSION=${NODE_VERSION} TEST_TARGET=${TEST_TARGET}"
           bash ${PROJECT_DIRECTORY}/.evergreen/run-checks.sh
+  run typescript:
+    - command: subprocess.exec
+      type: test
+      params:
+        working_dir: src
+        timeout_secs: 60
+        env:
+          PROJECT_DIRECTORY: ${PROJECT_DIRECTORY}
+          TS_VERSION: "${TS_VERSION}"
+          TRY_COMPILING_LIBRARY: "${TRY_COMPILING_LIBRARY}"
+        binary: bash
+        args:
+          - ${PROJECT_DIRECTORY}/.evergreen/run-typescript.sh
 
 tasks:
   - name: node-tests-v6
@@ -161,6 +174,36 @@ tasks:
           NODE_MAJOR_VERSION: 16
       - func: install dependencies
       - func: run checks
+  - name: check-typescript-oldest
+    commands:
+      - func: fetch source
+        vars:
+          NODE_MAJOR_VERSION: 16
+      - func: install dependencies
+      - func: "run typescript"
+        vars:
+          TS_VERSION: "4.0.2"
+          TRY_COMPILING_LIBRARY: "true"
+  - name: check-typescript-current
+    commands:
+      - func: fetch source
+        vars:
+          NODE_MAJOR_VERSION: 16
+      - func: install dependencies
+      - func: "run typescript"
+        vars:
+          TS_VERSION: ""
+          TRY_COMPILING_LIBRARY: "true"
+  - name: check-typescript-next
+    commands:
+      - func: fetch source
+        vars:
+          NODE_MAJOR_VERSION: 16
+      - func: install dependencies
+      - func: "run typescript"
+        vars:
+          TS_VERSION: "next"
+          TRY_COMPILING_LIBRARY: "false"
 
 buildvariants:
   - name: linux
@@ -180,3 +223,6 @@ buildvariants:
     run_on: rhel70
     tasks:
       - run-checks
+      - check-typescript-oldest
+      - check-typescript-current
+      - check-typescript-next

.evergreen/init-nvm.sh

@@ -0,0 +1,21 @@
+#! /usr/bin/env bash
+
+export PATH="/opt/mongodbtoolchain/v2/bin:$PATH"
+NODE_ARTIFACTS_PATH="${PROJECT_DIRECTORY}/node-artifacts"
+export NVM_DIR="${NODE_ARTIFACTS_PATH}/nvm"
+
+if [[ "$OS" == "Windows_NT" ]]; then
+    NVM_HOME=$(cygpath -w "$NVM_DIR")
+    export NVM_HOME
+    NVM_SYMLINK=$(cygpath -w "$NODE_ARTIFACTS_PATH/bin")
+    export NVM_SYMLINK
+    NVM_ARTIFACTS_PATH=$(cygpath -w "$NODE_ARTIFACTS_PATH/bin")
+    export NVM_ARTIFACTS_PATH
+    PATH=$(cygpath $NVM_SYMLINK):$(cygpath $NVM_HOME):$PATH
+    export PATH
+    echo "updated path on windows PATH=$PATH"
+else
+    [ -s "$NVM_DIR/nvm.sh" ] && source "$NVM_DIR/nvm.sh"
+fi
+
+export NODE_OPTIONS="--trace-deprecation --trace-warnings"

.evergreen/install-dependencies.sh

@@ -4,7 +4,6 @@ if [ -z "$NODE_VERSION" ]; then
   exit 1
 fi
 
-set -o xtrace   # Write all commands first to stderr
 set -o errexit  # Exit the script with error if any of the commands fail
 
 NODE_ARTIFACTS_PATH="${PROJECT_DIRECTORY}/node-artifacts"

.evergreen/run-typescript.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -o errexit # Exit the script with error if any of the commands fail
+
+# source "${PROJECT_DIRECTORY}/.evergreen/init-nvm.sh"
+
+set -o xtrace
+
+function get_current_ts_version {
+    node -e "console.log(require('./package-lock.json').dependencies.typescript.version)"
+}
+
+CURRENT_TS_VERSION=$(get_current_ts_version)
+
+export TSC="./node_modules/typescript/bin/tsc"
+export TS_VERSION=${TS_VERSION:=$CURRENT_TS_VERSION}
+
+npm install --no-save --force typescript@"$TS_VERSION"
+
+echo "Typescript $($TSC -v)"
+
+# check resolution uses the default latest types
+echo "import * as BSON from '.'" > file.ts && node $TSC --noEmit --traceResolution file.ts | grep 'bson.d.ts' && rm file.ts
+
+# check compilation
+rm -rf node_modules/@types/eslint # not a dependency we use, but breaks the build :(
+node $TSC bson.d.ts
+
+if [[ $TRY_COMPILING_LIBRARY != "false" ]]; then
+    npm run build:ts
+fi