diff --git a/src/completions/Help.ts b/src/completions/Help.ts
index d0f81550..06df344d 100644
--- a/src/completions/Help.ts
+++ b/src/completions/Help.ts
@@ -45,17 +45,16 @@ export class HelpCompletionSource extends Completions.CompletionSourceFuse {
             return
         }
 
-        let file, default_config, excmds, fns, settings, exaliases, bindings
-        if (
-            !(file = Metadata.everything.getFile("src/lib/config.ts")) ||
-            !(default_config = file.getClass("default_config")) ||
-            !(excmds = Metadata.everything.getFile("src/excmds.ts")) ||
-            !(fns = excmds.getFunctions()) ||
-            !(settings = config.get()) ||
-            !(exaliases = settings.exaliases) ||
-            !(bindings = settings.nmaps)
-        )
+        let file = Metadata.everything.getFile("src/lib/config.ts")
+        let default_config = file.getClass("default_config")
+        let excmds = Metadata.everything.getFile("src/excmds.ts")
+        let fns = excmds.getFunctions()
+        let settings = config.get()
+        let exaliases = settings.exaliases
+        let bindings = settings.nmaps
+        if (fns === undefined || exaliases === undefined || bindings === undefined) {
             return
+        }
 
         const flags = {
             "-a": (options, query) =>
@@ -64,7 +63,7 @@ export class HelpCompletionSource extends Completions.CompletionSourceFuse {
                         .filter(alias => alias.startsWith(query))
                         .map(alias => {
                             let cmd = aliases.expandExstr(alias)
-                            let doc = (excmds.getFunction(cmd) || {}).doc || ""
+                            let doc = (excmds.getFunction(cmd) || {} as any).doc || ""
                             return new HelpCompletionOption(
                                 alias,
                                 `Alias for \`${cmd}\`. ${doc}`,
@@ -108,8 +107,8 @@ export class HelpCompletionSource extends Completions.CompletionSourceFuse {
                     Object.keys(settings)
                         .filter(x => x.startsWith(query))
                         .map(setting => {
-                            let member,
-                                doc = ""
+                            let member
+                            let doc = ""
                             if ((member = default_config.getMember(setting))) {
                                 doc = member.doc
                             }
diff --git a/src/completions/Settings.ts b/src/completions/Settings.ts
index 11eb6d17..6b1532c6 100644
--- a/src/completions/Settings.ts
+++ b/src/completions/Settings.ts
@@ -61,13 +61,13 @@ export class SettingsCompletionSource extends Completions.CompletionSourceFuse {
 
         options += options ? " " : ""
 
-        let file, default_config, settings
-        if (
-            !(file = metadata.everything.getFile("src/lib/config.ts")) ||
-            !(default_config = file.getClass("default_config")) ||
-            !(settings = config.get())
-        )
+        let file = metadata.everything.getFile("src/lib/config.ts")
+        let default_config = file.getClass("default_config")
+        let settings = config.get()
+
+        if (default_config === undefined || settings === undefined) {
             return
+        }
 
         this.options = Object.keys(settings)
             .filter(x => x.startsWith(query))
diff --git a/src/excmds.ts b/src/excmds.ts
index 7b445a9e..fbf51371 100644
--- a/src/excmds.ts
+++ b/src/excmds.ts
@@ -3033,12 +3033,15 @@ export function searchsetkeyword() {
 function validateSetArgs(key: string, values: string[]) {
     const target: any[] = key.split(".")
 
-    let value, file, default_config, md
-    if ((file = Metadata.everything.getFile("src/lib/config.ts")) && (default_config = file.getClass("default_config")) && (md = default_config.getMember(target[0]))) {
+    let value
+    let file = Metadata.everything.getFile("src/lib/config.ts")
+    let default_config = file.getClass("default_config")
+    let md = default_config.getMember(target[0])
+    if (md !== undefined) {
         const strval = values.join(" ")
         // Note: the conversion will throw if strval can't be converted to the right type
         if (md.type.kind == "object" && target.length > 1) {
-            value = md.type.convertMember(target.slice(1), strval)
+            value = (md as any).type.convertMember(target.slice(1), strval)
         } else {
             value = md.type.convert(strval)
         }
diff --git a/src/lib/editor.ts b/src/lib/editor.ts
index f35b2610..5aa81cf3 100644
--- a/src/lib/editor.ts
+++ b/src/lib/editor.ts
@@ -508,7 +508,8 @@ export const backward_kill_line = wrap_input(
  **/
 export const kill_whole_line = wrap_input(
     needs_text((text, selectionStart, selectionEnd) => {
-        let firstNewLine, secondNewLine
+        let firstNewLine
+        let secondNewLine
         // Find the newline before the caret
         for (
             firstNewLine = selectionStart;
diff --git a/src/lib/math.ts b/src/lib/math.ts
index ee029bf6..573863bd 100644
--- a/src/lib/math.ts
+++ b/src/lib/math.ts
@@ -9,8 +9,8 @@ export function linspace(a: number, b: number, n?: number) {
     if (n < 2) {
         return n === 1 ? [a] : []
     }
-    var i,
-        ret = Array(n)
+    let i
+    let ret = Array(n)
     n--
     for (i = n; i >= 0; i--) {
         ret[i] = (i * b + (n - i) * a) / n
diff --git a/src/parsers/exmode.ts b/src/parsers/exmode.ts
index a26d18d8..61ad6988 100644
--- a/src/parsers/exmode.ts
+++ b/src/parsers/exmode.ts
@@ -26,7 +26,9 @@ function convertArgs(params, argv) {
     }
 
     const typedArgs = []
-    let type, arg, i
+    let type
+    let arg
+    let i
     for ([type, [i, arg]] of izip(params.values(), enumerate(argv))) {
         if (type in conversions) {
             typedArgs.push(conversions[type](arg))
diff --git a/tslint.json b/tslint.json
index 0d2df61d..069be103 100644
--- a/tslint.json
+++ b/tslint.json
@@ -32,7 +32,6 @@
     "no-variable-usage-before-declaration": false,
     "object-literal-key-quotes": false,
     "object-literal-sort-keys": false,
-    "one-variable-per-declaration": false,
     "only-arrow-functions": false,
     "ordered-imports": false,
     "prefer-const": false,