perf: host pre-compiled filetype mappings (#555)

Generating the filetype mappings by accessing `vim.lsp.config` turns out to be a bad idea because:
1) performance
2) some `lsp/` configurations in nvim-lspconfig execute code immediately (see angularls)
3) accessing `vim.lsp.config[server_name]` seems to populate `:checkhealth vim.lsp`

2 files changed, 14 insertions, 5 deletions

diff --git a/tests/mason-lspconfig/api/api_spec.lua b/tests/mason-lspconfig/api/api_spec.lua
index 53b3a27..e0a189e 100644
--- a/tests/mason-lspconfig/api/api_spec.lua
+++ b/tests/mason-lspconfig/api/api_spec.lua
@@ -1,4 +1,7 @@
+local stub = require "luassert.stub"
+
 local _ = require "mason-core.functional"
+local mappings = require "mason-lspconfig.mappings"
 local mason_lspconfig = require "mason-lspconfig"
 
 describe("mason-lspconfig API", function()
@@ -16,6 +19,10 @@ describe("mason-lspconfig API", function()
     end)
 
     it("should return all available servers for given filetype", function()
+        stub(mappings, "get_filetype_map", {
+            ["dummylang"] = { "dummylsp" },
+        })
+
         assert.same(
             { "dummylsp" },
             _.sort_by(
@@ -28,11 +35,9 @@ describe("mason-lspconfig API", function()
     end)
 
     it("should return all available servers for given filetypes", function()
-        vim.lsp.config("dummylsp", {
-            filetypes = { "dummylang" },
-        })
-        vim.lsp.config("dummy2lsp", {
-            filetypes = { "madeuplang" },
+        stub(mappings, "get_filetype_map", {
+            ["dummylang"] = { "dummylsp" },
+            ["madeuplang"] = { "dummy2lsp" },
         })
         assert.same(
             { "dummy2lsp", "dummylsp" },
diff --git a/tests/mason-lspconfig/api/command_spec.lua b/tests/mason-lspconfig/api/command_spec.lua
index 3cd6679..7b39c59 100644
--- a/tests/mason-lspconfig/api/command_spec.lua
+++ b/tests/mason-lspconfig/api/command_spec.lua
@@ -4,6 +4,7 @@ local stub = require "luassert.stub"
 
 local Pkg = require "mason-core.package"
 local api = require "mason-lspconfig.api.command"
+local mappings = require "mason-lspconfig.mappings"
 local registry = require "mason-registry"
 
 describe(":LspInstall", function()
@@ -23,6 +24,9 @@ describe(":LspInstall", function()
             local dummy = registry.get_package "dummy"
             spy.on(Pkg, "install")
             stub(vim.ui, "select")
+            stub(mappings, "get_filetype_map", {
+                ["dummylang"] = { "dummylsp" },
+            })
             vim.ui.select.invokes(function(items, opts, callback)
                 callback "dummylsp"
             end)