feat(mix): implement depType parsing

lib/modules/manager/mix/__fixtures__/mix.exs

@@ -36,6 +36,7 @@ defmodule MyProject.MixProject do
       {:another_gun, "~> 0.4.0", hex: :raygun},
       {:credo, "~> 1.7", only:
         [:test,
+        # prod,
         :dev],
         runtime: false}
     ]

lib/modules/manager/mix/extract.ts

@@ -20,6 +20,8 @@ const lockedVersionRegExp = regEx(
   /^\s+"(?<app>\w+)".*?"(?<lockedVersion>\d+\.\d+\.\d+)"/,
 );
 const hexRegexp = regEx(/hex:\s*(?:"(?<strValue>[^"]+)"|:(?<atomValue>\w+))/);
+const onlyValueRegexp = /only:\s*(?<only>\[[^\]]*\]|:\w+)/;
+const onlyEnvironmentsRegexp = /:(\w+)/gm;
 
 export async function extractPackageFile(
   content: string,
@@ -48,34 +50,45 @@ export async function extractPackageFile(
         const hexGroups = hexRegexp.exec(opts)?.groups;
         const hex = hexGroups?.strValue ?? hexGroups?.atomValue;
 
-        let dep: PackageDependency;
+        const onlyValue = onlyValueRegexp.exec(opts)?.groups?.only;
+        const onlyEnvironments = [];
+        let match;
+        if (onlyValue) {
+          while ((match = onlyEnvironmentsRegexp.exec(onlyValue)) !== null) {
+            onlyEnvironments.push(match[1]);
+          }
+        }
+
+        const dep: PackageDependency = {
+          depName: app,
+          depType: "dependencies"
+        };
 
         if (git ?? github) {
-          dep = {
-            depName: app,
-            currentDigest: ref,
-            currentValue: branchOrTag,
-            datasource: git ? GitTagsDatasource.id : GithubTagsDatasource.id,
-            packageName: git ?? github,
-          };
+          dep.currentDigest = ref;
+          dep.currentValue = branchOrTag;
+          dep.datasource = git ? GitTagsDatasource.id : GithubTagsDatasource.id;
+          dep.packageName = git ?? github;
         } else {
-          dep = {
-            depName: app,
-            currentValue: requirement,
-            datasource: HexDatasource.id,
-          };
+          dep.currentValue = requirement;
+          dep.datasource = HexDatasource.id;
           if (organization) {
             dep.packageName = `${app}:${organization}`;
           } else if (hex) {
             dep.packageName = hex;
           } else {
             dep.packageName = app;
           }
+
           if (requirement?.startsWith('==')) {
             dep.currentVersion = requirement.replace(regEx(/^==\s*/), '');
           }
         }
 
+        if (onlyValue !== undefined && !onlyEnvironments.includes("prod")) {
+          dep.depType = "devDependencies"
+        }
+
         deps.set(app, dep);
         logger.trace({ dep }, `setting ${app}`);
         depMatchGroups = depMatchRegExp.exec(depBuffer)?.groups;

lib/modules/manager/mix/readme.md

@@ -1,3 +1,8 @@
 The `mix` manager extracts dependencies for the `hex` datasource and uses Renovate's implementation of Hex SemVer to evaluate updates.
 
 The `mix` package manager itself is also used to keep the lock file up-to-date.
+
+The following `depTypes` are currently supported by the npm manager :
+
+- `dependencies`
+- `devDependencies`