fix(lsp): properly handle snippets on completions (#16274)

Fixes #15367

2 files changed, 82 insertions, 0 deletions

diff --git a/cli/tests/testdata/lsp/initialize_params.json b/cli/tests/testdata/lsp/initialize_params.json
index b076f3b17..68735b06d 100644
--- a/cli/tests/testdata/lsp/initialize_params.json
+++ b/cli/tests/testdata/lsp/initialize_params.json
@@ -56,6 +56,11 @@
           ]
         }
       },
+      "completion": {
+        "completionItem": {
+          "snippetSupport": true
+        }
+      },
       "foldingRange": {
         "lineFoldingOnly": true
       },
diff --git a/cli/tests/testdata/lsp/initialize_params_no_snippet.json b/cli/tests/testdata/lsp/initialize_params_no_snippet.json
new file mode 100644
index 000000000..b076f3b17
--- /dev/null
+++ b/cli/tests/testdata/lsp/initialize_params_no_snippet.json
@@ -0,0 +1,77 @@
+{
+  "processId": 0,
+  "clientInfo": {
+    "name": "test-harness",
+    "version": "1.0.0"
+  },
+  "rootUri": null,
+  "initializationOptions": {
+    "enable": true,
+    "cache": null,
+    "certificateStores": null,
+    "codeLens": {
+      "implementations": true,
+      "references": true,
+      "test": true
+    },
+    "config": null,
+    "importMap": null,
+    "lint": true,
+    "suggest": {
+      "autoImports": true,
+      "completeFunctionCalls": false,
+      "names": true,
+      "paths": true,
+      "imports": {
+        "hosts": {}
+      }
+    },
+    "testing": {
+      "args": [
+        "--allow-all"
+      ],
+      "enable": true
+    },
+    "tlsCertificate": null,
+    "unsafelyIgnoreCertificateErrors": null,
+    "unstable": false
+  },
+  "capabilities": {
+    "textDocument": {
+      "codeAction": {
+        "codeActionLiteralSupport": {
+          "codeActionKind": {
+            "valueSet": [
+              "quickfix",
+              "refactor"
+            ]
+          }
+        },
+        "isPreferredSupport": true,
+        "dataSupport": true,
+        "disabledSupport": true,
+        "resolveSupport": {
+          "properties": [
+            "edit"
+          ]
+        }
+      },
+      "foldingRange": {
+        "lineFoldingOnly": true
+      },
+      "synchronization": {
+        "dynamicRegistration": true,
+        "willSave": true,
+        "willSaveWaitUntil": true,
+        "didSave": true
+      }
+    },
+    "workspace": {
+      "configuration": true,
+      "workspaceFolders": true
+    },
+    "experimental": {
+      "testingApi": true
+    }
+  }
+}