Remove target_environment_may_be helper. NFC (#23160)

We already have the existing, and more widely used,
`ENVIRONMENT_MAY_BE_XX` settings.

tools/building.py

@@ -572,21 +572,21 @@ def closure_compiler(filename, advanced=True, extra_closure_args=None):
     CLOSURE_EXTERNS += [exports_file.name]
 
   # Node.js specific externs
-  if shared.target_environment_may_be('node'):
+  if settings.ENVIRONMENT_MAY_BE_NODE:
     NODE_EXTERNS_BASE = path_from_root('third_party/closure-compiler/node-externs')
     NODE_EXTERNS = os.listdir(NODE_EXTERNS_BASE)
     NODE_EXTERNS = [os.path.join(NODE_EXTERNS_BASE, name) for name in NODE_EXTERNS
                     if name.endswith('.js')]
     CLOSURE_EXTERNS += [path_from_root('src/closure-externs/node-externs.js')] + NODE_EXTERNS
 
   # V8/SpiderMonkey shell specific externs
-  if shared.target_environment_may_be('shell'):
+  if settings.ENVIRONMENT_MAY_BE_SHELL:
     V8_EXTERNS = [path_from_root('src/closure-externs/v8-externs.js')]
     SPIDERMONKEY_EXTERNS = [path_from_root('src/closure-externs/spidermonkey-externs.js')]
     CLOSURE_EXTERNS += V8_EXTERNS + SPIDERMONKEY_EXTERNS
 
   # Web environment specific externs
-  if shared.target_environment_may_be('web') or shared.target_environment_may_be('worker'):
+  if settings.ENVIRONMENT_MAY_BE_WEB or settings.ENVIRONMENT_MAY_BE_WORKER:
     BROWSER_EXTERNS_BASE = path_from_root('src/closure-externs/browser-externs')
     if os.path.isdir(BROWSER_EXTERNS_BASE):
       BROWSER_EXTERNS = os.listdir(BROWSER_EXTERNS_BASE)

tools/link.py

@@ -1440,7 +1440,7 @@ def phase_linker_setup(options, state, newargs):  # noqa: C901, PLR0912, PLR0915
       if 'MODULARIZE' in user_settings:
         exit_with_error('EXPORT_ES6 requires MODULARIZE to be set')
       settings.MODULARIZE = 1
-    if shared.target_environment_may_be('node') and not settings.USE_ES6_IMPORT_META:
+    if settings.ENVIRONMENT_MAY_BE_NODE and not settings.USE_ES6_IMPORT_META:
       # EXPORT_ES6 + ENVIRONMENT=*node* requires the use of import.meta.url
       if 'USE_ES6_IMPORT_META' in user_settings:
         exit_with_error('EXPORT_ES6 and ENVIRONMENT=*node* requires USE_ES6_IMPORT_META to be set')
@@ -1767,7 +1767,7 @@ def get_full_import_name(name):
   if settings.NODE_CODE_CACHING:
     if settings.WASM_ASYNC_COMPILATION:
       exit_with_error('NODE_CODE_CACHING requires sync compilation (WASM_ASYNC_COMPILATION=0)')
-    if not shared.target_environment_may_be('node'):
+    if not settings.ENVIRONMENT_MAY_BE_NODE:
       exit_with_error('NODE_CODE_CACHING only works in node, but target environments do not include it')
     if settings.SINGLE_FILE:
       exit_with_error('NODE_CODE_CACHING saves a file on the side and is not compatible with SINGLE_FILE')
@@ -2366,11 +2366,11 @@ def phase_binaryen(target, options, wasm_target):
 
 
 def node_es6_imports():
-  if not settings.EXPORT_ES6 or not shared.target_environment_may_be('node'):
+  if not settings.EXPORT_ES6 or not settings.ENVIRONMENT_MAY_BE_NODE:
     return ''
 
   # Multi-environment builds uses `await import` in `shell.js`
-  if shared.target_environment_may_be('web'):
+  if settings.ENVIRONMENT_MAY_BE_WEB:
     return ''
 
   # Use static import declaration if we only target Node.js
@@ -2397,8 +2397,8 @@ def modularize():
   # Multi-environment ES6 builds require an async function
   async_emit = ''
   if settings.EXPORT_ES6 and \
-     shared.target_environment_may_be('node') and \
-     shared.target_environment_may_be('web'):
+     settings.ENVIRONMENT_MAY_BE_NODE and \
+     settings.ENVIRONMENT_MAY_BE_WEB:
     async_emit = 'async '
 
   # TODO: Remove when https://bugs.webkit.org/show_bug.cgi?id=223533 is resolved.
@@ -2446,7 +2446,7 @@ def modularize():
       script_url = 'import.meta.url'
     else:
       script_url = "typeof document != 'undefined' ? document.currentScript?.src : undefined"
-      if shared.target_environment_may_be('node'):
+      if settings.ENVIRONMENT_MAY_BE_NODE:
         script_url_node = "if (typeof __filename != 'undefined') _scriptName = _scriptName || __filename;"
     if settings.MODULARIZE == 'instance':
       src = '''%(node_imports)s

tools/shared.py

@@ -640,10 +640,6 @@ def get_temp_files():
     return tempfiles.TempFiles(TEMP_DIR, save_debug_files=False)
 
 
-def target_environment_may_be(environment):
-  return not settings.ENVIRONMENT or environment in settings.ENVIRONMENT.split(',')
-
-
 def print_compiler_stage(cmd):
   """Emulate the '-v/-###' flags of clang/gcc by printing the sub-commands
   that we run."""