diff --git a/languages.toml b/languages.toml
index 5ad48c0c8..0661d9c3e 100644
--- a/languages.toml
+++ b/languages.toml
@@ -742,6 +742,7 @@ injection-regex = "(js|javascript)"
 language-id = "javascript"
 file-types = ["js", "mjs", "cjs", "rules", "es6", "pac", { glob = ".node_repl_history" }, { glob = "jakefile" }]
 shebangs = ["node"]
+roots = [ "package.json" ]
 comment-token = "//"
 block-comment-tokens = { start = "/*", end = "*/" }
 language-servers = [ "typescript-language-server" ]
@@ -769,6 +770,7 @@ scope = "source.jsx"
 injection-regex = "jsx"
 language-id = "javascriptreact"
 file-types = ["jsx"]
+roots = [ "package.json" ]
 comment-token = "//"
 block-comment-tokens = { start = "/*", end = "*/" }
 language-servers = [ "typescript-language-server" ]
@@ -782,6 +784,7 @@ injection-regex = "(ts|typescript)"
 language-id = "typescript"
 file-types = ["ts", "mts", "cts"]
 shebangs = ["deno", "bun", "ts-node"]
+roots = [ "package.json", "tsconfig.json" ]
 comment-token = "//"
 block-comment-tokens = { start = "/*", end = "*/" }
 language-servers = [ "typescript-language-server" ]
@@ -814,6 +817,7 @@ scope = "source.tsx"
 injection-regex = "(tsx)" # |typescript
 language-id = "typescriptreact"
 file-types = ["tsx"]
+roots = [ "package.json", "tsconfig.json" ]
 comment-token = "//"
 block-comment-tokens = { start = "/*", end = "*/" }
 language-servers = [ "typescript-language-server" ]